Atomic Mass Unit

This paper summarizes the history of positions taken and the reasons given by IUPAC’s. It is defined to be one twelfth of the mass of an unbound atom of the carbon-12 nuclide, at rest and in its ground state. 1: Atomic Mass Unit Atomic Mass is defined relative to Carbon -12 isotope 12 amu is the mass of the isotope of carbon Carbon -12 atom = 12. Calculate the average atomic weight when given isotopic weights and abundances. 6726219xx10^(-27) kg#. This indicates how strong in your memory this concept is. Our study guide asks 1 to 2 sentences. Carbon exists as two major isotopes, 12C, and 13C ( 14C exists and has. 184 J (by definition) N_avogadro = 6. However, because individual atoms have very small masses, this is not very helpful. – 1 atom of chlorine has an average mass of 35. Give evidence to support or dispute: "In nature, the chance of finding one isotope of an element is the same for all isotopes. Visit one of our unique Walkthrough Warehouse today!. org dictionary, synonyms and antonyms. ››More information from the unit converter. org Dictionary. Chemistry Posted by answersmine. 99 atomic mass units. site:answers. 66x10-27 kilograms. By definition the atomic mass of a single 12 C atom is exactly 12 atomic mass units (denoted by the abbreviation amu or u). Molecular mass or molar mass are used in stoichiometry calculations in chemistry. so whenever you have mass, it means you've got lots of energy just sitting inside. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. An arbitrarily defined unit in terms of which the masses of individual atoms are expressed. quadrupole mass spectrometers that typically cover mass ranges from 1 to 100 or 200 amu (atomic mass units), and are intended to be used for the analysis of the gasses present in high and ultra-high vacuum. The origin of these problems is found in the concept definitions. Molar mass is measured in grams per mole while atomic mass is "unitless. The mass molarity calculator tool calculates the mass of compound required to achieve a specific molar concentration and volume. This unit is defined as 1/12 of the mass of a carbon-12 atom at ground state. Johnny · 1 decade ago. The current system of atomic masses was instituted in 1961 and is based on the mass of 12 C (read carbon twelve). Atomic Number. 66053904 x 10-27 kg. The mass of one carbon-12 atom is set at 12 amu; the atomic mass of atoms of all other elements is determined relative to the mass of carbon-12. So then, why isn't the atomic mass of Hydrogen exactly 1? If you check a periodic table, you'll see that Hydrogen actually has a mass of 1. Since the unified atomic mass unit is defined as 1/12 of the mass of 12C the calibration of the magnetic. However, because each atom has a very small mass, this is not very helpful. m = mass measured in kilograms (kg) c = the speed of light 3 x 10 8 ms-1. It is expected that the somewhat clumbsy "unified atomic mass unit. An ion with mass number 37 possesses one unit of negative charge. • The unified atomic mass unit (symbol: u) or Dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic scale (atomic mass). This means that some results will be rounded to avoid the numbers getting too long. However, because individual atoms have very small masses, this is not very helpful. Atomic Mass Units. [/caption] Believe it or not, there are actually several atomic mass units … however, the one that's standard - throughout chemistry, physics, biology, etc - is the unified atomic mass. Note that rounding errors may occur, so always check the results. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. This is the standard unit for atomic or molecular mass, and 1 amu is thus 1/12 th the mass of a 12 C atom. The mass of an element is expressed in amu (atomic mass units). We use rounding at unit-conversion. Chemists regard the atom as the fundamental building block of all matter. , 1 amu = 1/N[math]_A[/math] g). 0221367e23 (per mol) 1 Debye = 0. 81 Mass #: Atomic Mass Number rounded to the nearest whole number. The atomic mass unit (u or amu) is one unit for measuring the atomic mass of particles. Atomic mass can be expressed in grams. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Note: Atomic mass unit is a metric unit of weight. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. com with free online thesaurus, antonyms, and definitions. 81 u istead of 10 or 11. This list contains the 118 elements of chemistry. For example, any atom that contains exactly 47 protons in its nucleus is an atom of silver. What are synonyms for Atomic mass unit (amu)?. Featured educator: John Wolfe; 30 August 2019. Though the abbreviation amu is used in this book, atomic mass units are sometimes designated. Why do we specify 12C? We do not simply state that the mass of a C atom is 12 AMU because elements exist as a variety of isotopes. One atomic mass unit is defined as exactly of the mass of an atom of the nuclide 12 C, the predominant isotope of carbon. Viewed 682 times 0 $\begingroup$ This question already has an answer here:. Atomic mass is measured in a unit called an "atomic mass unit". 02214129•10²³ mol⁻¹ — Avogadro constant. 0093 amu and its abundance is 80. Which of the following equals one atomic mass unit? a. 0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0. The unit for molar mass and given mass is. One atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope. Information about atomic mass in the AudioEnglish. 02214179(30) x 10 23 particles is 1 gram, according to the Avogadro Constant. When calculations are necessary, show all work and all units!!! Remember, when solving problems involving mass, the periodic table will be your friend. We use rounding at unit-conversion. And this is called the atomic mass. Learn more. Atomic mass can be expressed in grams. I love Google's calculator. Showing top 8 worksheets in the category - Atomic Mass Unit. In this experiment magnesium ribbon reacts with dilute hydrochloric acid to produce hydrogen gas, which is collected in a burette. Estimating Isotopic Mass. atomic mass unit pronunciation. 66053886 * 10 -24. Tanabashi et al. a unit used for measuring atomic mass, equal to one twelfth of the mass of an atom of carbon in…. 8 Newtons under standard conditions on the Earth's surface. You should know that an alpha particle. An atomic mass unit, also known as AMU, is the unit used to measure the weight of protons and neutrons. 6605 x 10-24 gram and is equivalent to 931. 6603145E-27 kilogram. Our study guide asks 1 to 2 sentences. a·tom·ic mass unit (amu) (ă-tom'ik mas yū'nit). Protons and neutrons have masses of approximately 1 atomic mass unit each, whereas electrons only have a mass of. If you stay in midtown, it's only a minute /couple of bucks uber to downtown and may be cheaper (if you're like airb&b'ing e. Molar mass of any substance is the ratio of the mass of the given substance to the amount of that substance, in one mole of the substance. Atomic Number. It is defined to be 1/12 of the mass of one atom of Carbon-12. Same 4 average atomic weight. One Dalton = 1 amu. atomic mass unit was earuer written in short as 'amu' but these days it is denoted by the letter this means that a carbon-12 atom has been assisned an atomic m ass of exact uy 12u therefore, atomic mass unit shovud scanned by camscanner. 66 × 10 −24 grams. The total mass numbers on each side of the equation should be equal [1]. Select the 'check' button to see if you answered correctly. Instead, atomic mass is expressed in unified atomic mass units (unit symbol: u). Meaning of atomic mass unit. Mass of proton: Mass of proton is 1. The mass number (symbol A, from the German word Atomgewicht (atomic weight)), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. 013 amu and is 19. An atomic mass unit is equal to. This is obviously very small. This is commonly expressed as per the international agreement in terms of a unified atomic mass unit (amu). They are the smallest components of a chemical element, which is a substance that cannot be broken down into simpler material. 1 원자 질량 단위는 대략 핵자 하나의 질량이고 수치적으로 1 g/mol과 동등하다. 4 L = 1 mole of gas. The "unified atomic mass unit" is not really a unit at all but a physical quantity denoted by m u and defined as 1/12 of the mass of an atom of ¹²C. 0625) the mass of one oxygen atom, but after 1961 based on 1/12 (0. 81 Mass #: Atomic Mass Number rounded to the nearest whole number. This is not correct. Atomic mass unit | unified atomic mass unit | u | dalton | Da. 48 MeV in energy: symbol amu or u …. :18 1 u has a value of 1. a unit of mass, exactly one twelfth the mass of a neutral atom of the most abundant isotope of carbon, C12: one atomic mass unit equals 1. 4 L = 1 mole of gas. To measure atomic masses the atomic mass unit (amu) is employed. One way of dealing with atomic weights that gets around the "relative" aspect would be to find out how much each atom actually weighs. The unit for molar mass and given mass is. The unified atomic mass unit (Also known as amu, symbol: u) or dalton (symbol: Da) is a unit that is used for indicating mass on an atomic or molecular scale. 1 amu = 1/12 the mass of one Carbon-12 atom. UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Electron Configuration Nuclear Charge Anion Element Nucleons Atom Excited state Nucleus Atomic Mass Ground state Orbital Atomic Mass unit (a. 0 % 63 Cu and 75. The atomic mass of an atom will change depending on its amount of protons and neutrons, and will. Or P B B 13. 1986, 63, 1 PAC, 1996, 68, 957. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Antonyms for atomic mass unit This page is about all possible antonyms and opposite words for the term atomic mass unit. Atomic Mass Unit. Atomic mass is the mass of an atom and is given in a. (atomic mass unit). amu A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon-12, which is assigned a mass of 12. atomic mass unit definition: a unit of mass, exactly one twelfth the mass of a neutral atom of the most abundant isotope of carbon, carbon-12: one atomic mass unit equals 1. 66053886×10-12 pg u>pg pg>u What is pg; 1 u = 1. Meaning of atomic mass unit. D) It has a smaller mass than a proton and a negative charge. Though the abbreviation amu is used in this book, atomic mass units are sometimes designated. This equation tells us that mass can be converted into energy and energy can be converted into mass. The relative atomic mass of an element is the weighted average of the masses of the isotopes on a scale on which a carbon-12 atom has a mass of exactly 12 units. 1 H Hydrogen 1. Here you can make instant conversion from this unit to all other compatible units. † The current definitions of the atomic mass unit and of the mole, officially adopted in 1961 and 1971, respectively, are the primary sources of confusion. What you quoted is electron mass. Atomic mass unit From Wikipedia, the free encyclopedia Jump to: navigation, search The unified atomic mass unit (u), or dalton (Da), is a small unit of mass used to express atomic and molecular masses. It is obvious, then, that an entirely different unit is needed for measuring the mass of an atom, and for this purpose, chemists and other scientists use an atom mass unit (abbreviated amu), which is equal to 1. 9118 amu) and 87X (27. The atomic number is equal to the number of protons in an atom's nucleus. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere. How can this information help us determine the atomic masses of other elements? Experiments can be done to determine the relative mass of an element compared to carbon. Mass is the amount of matter in an object. This quiz has been developed to test your knowledge about atomic numbers, protons, atomic mass and neutrons. Calculate the average atomic mass of an element with two naturally occurring isotopes: 85X (72. Find and save ideas about Atomic mass unit on Pinterest. Type the missing chemical symbol in each box. atomic mass unit (amu) Definition: Search for: Biology Glossary search by EverythingBio. Though the abbreviation amu is used in this book, atomic mass units are sometimes designated. Under this. 742% of iron in human blood, whereas, it accounts for 91. AMU is average (rounded) atomic number (number of protons) plus number of neutrons in nature, or the number underneath the element name, for example, cl (chlorine) has an AMU of 35. Define the atomic mass unit. 845 u to only 5 significant digits. The unified atomic mass unit, or #u#, is defined as the mass of one nucleon, that is a proton or a neutron. If these definitions are adjusted for teaching purposes, understanding could be improved. 023 x 1023 amu in one gram (Avogadro number). 67x10-24 grams) and located in the nucleus. Free gamified quizzes on every subject that students play in class and at home. Atomic Mass Unit A unit of mass equal to the mass of a single atom of the most common isotope of carbon, , divided by 12, An older definition was based on the mass of the a single atom of the most common isotope of oxygen, , divided by 16. 0151223 amu and 92. atomic mass unit or amu, in chemistry and physics, unit defined as exactly 1⁄12 the mass of an atom of carbon-12, the isotope of carbon with six protons and six neutrons in its nucleus. Therefore, one can say that mass is an expression of. Referring to the definition of the mole, it must. For example, an astronaut would be almost weightless in outer space, but his or her mass would be unchanged from that on Earth. Relative isotopic mass: the same quantity as atomic mass, but with different units. In this case, an amu is defined as a 6. Atomic Unit of Mass (12C) (u, uma, Da(12 C), AMU) has a dimension of M where M is mass. What were the benefits of developing the atomic mass unit as a standard unit of mass? Its just the amount of protons and neutrons*6. How many kilograms in an atomic mass unit: If m u = 1 then m kg = 1. This is the standard unit for atomic or molecular mass, and 1 amu is thus 1/12 th the mass of a 12 C atom. Practice Problems: Atomic Mass (Answer Key) The element bromine has three naturally-occurring isotopes. 0079 and carbon is 12. Before 1961, the physical atomic mass unit (amu) was defined as 1 ⁄ 16 of the mass of one atom of oxygen-16, while the chemical atomic mass unit (amu) was defined as 1 ⁄ 16 of the average mass of an oxygen atom (taking the natural abundance of the different oxygen isotopes into account). 48 MeV in energy: symbol amu or u …. Free gamified quizzes on every subject that students play in class and at home. – 1 atom of chlorine has an average mass of 35. the mass of one carbon-12 atom d. We use rounding at unit-conversion. Amino Acids: Formula, Molecular Weight Amino Acids: Formula, Molecular Weight Molecular weight, g/mol; Isoleucine: C 6 H 13 NO 2: Unit converters:. 0000000 amu. An atomic mass unit is a very small unit of mass, about 1. Atomic Mass Unit. 992646547 × 10 −23 gram, which is assigned an atomic mass of 12 units. 000 amu Hydrogen -1 atom = 1. Atomic Mass Units. One atomic mass unit is equal to 1. 1% abundant. ill write out a problem, calculate the average atomic mass of iridium using the following data for two iridium isotopes. quadrupole mass spectrometers that typically cover mass ranges from 1 to 100 or 200 amu (atomic mass units), and are intended to be used for the analysis of the gasses present in high and ultra-high vacuum. There is a slight difference since the relative atomic mass has no units; it is a measure of mass relative to the carbon-12 atom. Thumbs down. The unit for these measurements is the (Atomic Mass Unit). Although similar in mass, protons are positively charged, while neutrons have no charge. Molar mass is the mass of one mole per single element while atomic mass is the mass of an atom at rest or is the number of protons and neutrons. Use this page to learn how to convert between atomic mass units and kilograms. Synonyms for atomic mass at Thesaurus. Energy Conversion Table (analytical). I know that the mass of a proton is 1. If hydrogen was assigned a mass of 1 exactly, then oxygen would have become 15. 6603145E-27 kilogram. 02214179(30) x 10 23 atomic mass units (the mass of a particle is approximately one atomic mass unit). ‘The mass standard in the atomic world is set by one atom of the element carbon, which is defined to be 12 atomic mass units. I mentioned that these are relative atomic weights because they were compared to hydrogen (then oxygen and then carbon-12). It is easy enough to look up the weights of $\ce{^{12}C}$ (12. See also: CRC Handbook of Chemistry and Physics, 72nd edition, p. Atomic Mass Unit A unit of mass equal to the mass of a single atom of the most common isotope of carbon, , divided by 12, An older definition was based on the mass of the a single atom of the most common isotope of oxygen, , divided by 16. cc | Übersetzungen für 'atomic mass unit AMU amu [unified atomic mass unit]' im Englisch-Deutsch-Wörterbuch, mit echten Sprachaufnahmen, Illustrationen, Beugungsformen,. This website and its content is subject to our Terms and Conditions. ATOMICMASSUNIT Atomic mass unit The unified atomic mass unit or dalton is the standard unit that is used for indicating mass on an atomic or molecular scale. Here you can make instant conversion from this unit to all other compatible units. unified atomic mass unit. Synonyms for atomic mass unit in Free Thesaurus. 81 u istead of 10 or 11. One atomic mass unit is equal to 1. ’ ‘A Dalton, also known as an atomic mass unit, is roughly the mass of a single proton or neutron. Atomic mass is measured via mass spectrometry while molar mass is computed via atomic weight. Give evidence to support or dispute: "In nature, the chance of finding one isotope of an element is the same for all isotopes. atomic mass unit: atomic mass unit [the ~] noun. average atomic mass of lithium is 6. Information about atomic mass unit in the AudioEnglish. "Atomic mass" is relative to the isotope carbon-12 weighing exactly 12 atomic mass units. See also: weight units. 66 x 10-24 grams. Johnny · 1 decade ago. 012 kilogram of carbon-12; its symbol is “mol”. An atomic mass unit is approximately equal to the mass of a proton or neutron. If I had an atom e. It is the approximate mass of a hydrogen atom, a proton, or a neutron. It is a very important dietary requirement. The gram (g) is equal to 1⁄1000 of a kilogram(or 1E-3kg). The atomic number determines which element an atom is. See also: CRC Handbook of Chemistry and Physics, 72nd edition, p. 1 word related to atomic mass unit: mass unit. Write down the conversion factors that would be used to convert between the following units: Molar Mass (periodic table) Avogadro's #. Atomic mass can be expressed in grams. Both atomic mass and atomic weight are represented using a unit called the atomic mass unit ( amu), which was defined using carbon's most common isotope, carbon-12. Although the standard SI unit for Molar Mass is kilogram per mol (kg/mol) it is most commonly described with grams per mol (g/m). atomic mass unit — n. Because the value of a mole is equivalent to that of a gram, the mass for 6. Why do we specify 12C? We do not simply state that the mass of a C atom is 12 AMU because elements exist as a variety of isotopes. For this reason, a special unit called the Atomic Mass Unit (amu) is often used. 660 5 38 9 21(73) × 10 −27. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. 67x10-24 grams) and located in the nucleus. He predicted 68 for the atomic mass. Search for crossword clues found in the Daily Celebrity, NY Times, Daily Mirror, Telegraph and major publications. 969 amu 12C 6 3 5. How to convert atomic mass units to kilograms [u to kg]: m kg = m u ×1. This paper summarizes the history of positions taken and the reasons given by IUPAC’s. UNIT 2 - ATOMIC THEORY VOCABULARY: Allotrope Electron Configuration Nuclear Charge Anion Element Nucleons Atom Excited state Nucleus Atomic Mass Ground state Orbital Atomic Mass unit (a. The unit for these measurements is the (Atomic Mass Unit). Elements, and consequently the atoms, now had a specific mass that could be described in units of hydrogen. 000 amu for the atomic mass of an atom of oxygen. The element bromine has two naturally-occurring isotopes. The atomic mass is defined as the mass of an atom expressed in atomic mass units. This page was last edited on 15 October 2019, at 03:51. How many kilograms in an atomic mass unit: If m u = 1 then m kg = 1. The atomic mass unit, abbreviated as u, is a unit of measurement for atomic and molecular masses, in relation to other atoms or molecules. The polyprotein Gag of the HIV-1 virus has a mass of 55 kDa. Study First 20 Elements, Atomic Number and Mass. Atomic Mass and Atomic Mass Unit. Moreover, there is a difference between atomic mass and molecular weight in the way we calculate these two quantities. 0221367e23 (per mol) 1 Debye = 0. 4857990e-4 u ( unified atomic mass unit) = 9. atomic mass unit: atomic mass unit [the ~] noun. ’ ‘At the other end, an atomic mass unit equals 1. atomic mass unit synonyms, atomic mass unit pronunciation, atomic mass unit translation, English dictionary definition of atomic mass unit. Unit Conversion Worksheet Pdf – If you find a template that you would like to use, you may also double-click on the template thumbnail to open it on your document window and start customizing it! You will discover that a number of the templates are absolutely free to use and others call for a premium account. The atomic mass is usually measured in the units unified atomic mass unit (u), or dalton (Da). Avogadro’s number : the number of units in one mole: 6. Boys HighSchool#1,DGKhan03321764856. Practice Problems: Atomic Mass. The unified atomic mass unit (symbol: u) or dalton (symbol: Da) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass). Showing top 8 worksheets in the category - Atomic Mass Unit. Definition of atomic mass in the AudioEnglish. Molar mass is measured in grams per mole while atomic mass is "unitless. 6604 × 10 −27 kg. 8 is found to contain 2 isotopes having a relative atomic mass of 20 and 21. All isotopes of an element do not occur naturally in the same proportions. Electron Mass In section 4 the ratio of electron mass to photon mass is not integer number, if which represents photon’s head mass is added to electron mass In this case the ratio is an integer number; this means that there are 2 masses for the electron which can be described as the free electron with mass and the bounded electron with mass. Cite as: IUPAC. unit of mass for expressing masses of atoms or molecules. 66 x 10-24 grams. X-ray diffraction data shows that the length of one edge of the cubic unit cell for TiO with 1:1 ratio of Ti to O is 418 pm and the density is 4. Synonyms for Atomic mass unit (amu) in Free Thesaurus. How much energy?. An electron's mass is so small that it is usually given a value in atomic mass units, compared to the value of 1 assigned to neutrons and protons. The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy making minor contributions. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. Meaning of atomic mass unit. In addition, a variety of different mass units are used outside the SI system, such. 00 We can estimate the mass of any isotope of an element, its isotopic mass, using its mass number (A). What is the abbreviation for Atomic Mass Unit? What does AMU stand for? AMU abbreviation stands for Atomic Mass Unit. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1g/mol. Class practical. You should also know there is a difference between mass and weight. We hope that the following list of synonyms for the word atomic mass unit will help you to finish your crossword today. the mass of one electron b. Information about atomic mass unit in the AudioEnglish. atomic mass unit Unit of mass that is used to measure the relative mass of atoms and molecules. 0833) the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles. Chemistry Posted by answersmine. In related terms, another unit of mass often used is Dalton (Da) or unified atomic mass unit (u) when describing atomic masses and molecular masses. atomic mass unit pronunciation. In this experiment magnesium ribbon reacts with dilute hydrochloric acid to produce hydrogen gas, which is collected in a burette. This page was last edited on 15 October 2019, at 03:51. amu A unit of mass equal to 1/12 the mass of the most abundant isotope of carbon, carbon-12, which is assigned a mass of 12. The atomic mass or atomic weight is the decimal number, The number of significant figures varies according to the table, but the value is around 12. Synonyms for atomic mass unit in Free Thesaurus. Atomic mass is the mass of an atom and is given in a. It is defined to be one twelfth of the mass of an unbound atom of the carbon-12 nuclide, at rest and in its ground state. This station will provide students with a one page reading about atomic structure. The molar mass (symbol: M) of glucose is 180 g mol-1; the relative molecular mass (symbol: M r) of glucose is 180; the molecular mass of glucose is 180 atomic mass units (symbol: u). However, because individual atoms have very small masses, this is not very helpful. A balloon. One amu or dalton is one-twelfth the mass of a carbon 12 atom (in other words, the mass of a hydrogen atom, 1. The unit of measure for mass is the atomic mass unit (amu). What is Atomic Mass? Every particle of matter has some amount of mass associated with it whether small or large. Mass is a measure of the matter in an object while weight is a measure of gravity’s pull on an object. As another significant difference between atomic mass and molecular weight, the unit of measurement of atomic mass is amu while the unit for molecular weight is g/mol. org dictionary, synonyms and antonyms. Therefore, the relative atomic mass of hydrogen-1 is 1, making it the lightest of all atoms. This is a touring-ready boot that’s the result of that evolution. The Atomic mass unit [u] to gram [g] conversion table and conversion steps are also listed. 63068 cm^-1 = 627. However, mass is the amount of matter in an object and weight is the amount of mass times the gravitational pull on an object which makes atomic mass the preferred term. However, because each atom has a very small mass, this is not very helpful. See also: CRC Handbook of Chemistry and Physics, 72nd edition, p. "ANYTHING THAT HAS MASS AND TAKES UP SPACE and is made up of different kinds of atoms; includes all things that can be seen, tasted, smelled, or touched but does not include heat, sound, or light" -WHAT ALL OBJECTS ARE MADE OF. 23 sentence examples: 1. carbon-12 atdm has been assigned an atomic mass of exaltly 12 atomic mass units scanned by camscanner. :18 1 u has a value of 1. Write the atomic symbols for each isotope. Atomic Mass Unit The atomic mass unit (u or amu) is a relative unit based on a carbon-12 atom with six protons and six neutrons, which is assigned an exact value of 12 amu's (u's).