what does atomic mass means
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Definitions &Translations Definitions for atomic mass. atomic mass, atomic weight, relative atomic mass(noun) (chemistry) the mass of an atom of a chemical element expressed in atomic mass units. atomic mass(Noun) The mass of an atom. atomic mass(Noun) atomic weight; the average mass of atoms of an element.
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- The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.
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Atomic mass It is commonly expressed in unified atomic mass units (u) where by international agreement, 1 unified atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom (at rest).
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Atomic mass From Wikipedia, the free encyclopedia. An atomic mass (symbol: m a) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons. Atomic mass can be expressed in grams. However, because individual atoms have very small masses, this is not very helpful.
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Atomic Mass Unit Definition (amu) Also Known As: unified atomic mass unit (u), Dalton (Da), universal mass unit, either amu or AMU is an acceptable acronym for atomic mass unit The unified atomic mass unit is a physical constant that is accepted for use in the SI measurement system.
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Relative atomic mass Standard atomic weights: periodicity. An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of 12 C in its nuclear and electronic ground state. (Refs. 1 and 2).
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Chemistry: Molar Mass Average Atomic Mass. The weighted Average of the masses of all the isotopes of an element. This means that all hydrogen atoms have the same mass, all helium atoms have the same mass, and so on.
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Mass In this context, the mass has units of eV/c2 (where c is the speed of light). The electronvolt and its multiples, such as the MeV (megaelectronvolt), are commonly used in particle physics. the atomic mass unit (u) is 1/12 of the mass of a carbon-12 atom, approximately 6973166000000000000♠1.66×10−27 kg.
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4.4: The Properties of Protons, Neutrons, and Electrons The second column shows the masses of the three subatomic particles in atomic mass units. An atomic mass unit (\(\text{amu}\)) is defined as one-twelfth the mass of a carbon-12 atom. Atomic mass units (\(\text{amu}\)) are useful, because, as you can see, the mass of a proton and the mass of a neutron are almost exactly \(1.0\) in this unit system.
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Chemistry Term 1 Final d Atomic mass number. An average of the masses of each of the iostopes of an element as they occur in mature. (Represents the number of protons and the number of neutrons in an element because electrons essentially have no mass).
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- atomic mass noun [C or U]. › the ​mass of a ​specific ​isotope of a ​particular ​chemical ​element, usually ​expressed in ​atomic ​mass ​units Compare relative atomic mass. Compare. relative atomic mass. (Definition of atomic mass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press).
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- The relative atomic mass is a measure of the mass of one atom of the element. In all chemical reactions reactants create products. The greater the amount of reactants used, the greater the amount of products produced.
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atomic mass unit atomic mass unit. A unit of mass equal to 1/12 the mass of an atom of the most common isotope of carbon (carbon 12), which is assigned a mass of 12. A hydrogen atom has a mass of 1 atomic mass unit since its mass is 1/12 the mass of carbon 12.
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Glossary of Physics Terms Relative atomic mass. The mass of an atom relative to that of carbon-12. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average. Isotopes. Atoms of the same element with different numbers of neutrons.
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MASTERING PHYSICAL CHEMISTRY By-- S.K. The atomic weight scale defines the masses of atoms relative to the mass of an atom of 12C, which is assigned a mass of exactly 12.000 atomic mass units (amu). The number 12 is chosen so that the least massive atom, hydrogen, has a mass of about 1 (actually 1.008) on the scale.
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Atomic mass The atomic mass (ma) is the mass of an atom. Its unit is the unified atomic mass units (symbol: u, or Da) where 1 unified atomic mass unit is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest.
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Atomic mass The atomic mass (m a) is the mass of an atom. Its unit is the unified atomic mass units (symbol: u, or Da) where 1 unified atomic mass unit is defined as 1 ⁄ 12 of the mass of a single carbon-12 atom, at rest.
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Atom The actual mass of an atom at rest is often expressed using the unified atomic mass unit (u), also called dalton (Da). This unit is defined as a twelfth of the mass of a free neutral atom of carbon-12, which is approximately 6973166000000000000♠1.66×10−27 kg.
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Relative atomic mass The IUPAC definition of relative atomic mass is: An atomic weight (relative atomic mass) of an element from a specified source is the ratio of the average mass per atom of the element to 1/12 of the mass of an atom of 12C. The definition deliberately specifies An atomic weight…, as an element will have different relative atomic masses depending on the source.
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Definition of Terms Atomic Weight. The atomic weight of an element is the weighted average of the atomic masses of the different isotopes of an element. Naturally occurring carbon, for example, is a mixture of two isotopes, 12 C (98.89%) and 13 C (1.11 %). Individual carbon atoms therefore have a mass of either 12.000 or 13.03354 amu.
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- Answers. Best Answer: Molar mass. Atomic mass is the mass of one atom Molecular mass is the mass of one molecule Gram atomic mass is, according to Wikipedia (since I didn't know that one) the same thing as molar mass. Source(s): Anna Banana · 7 years ago. Thumbs up.
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Atomic Mass The current system of atomic masses was instituted in 1961 and is based on the mass of 12 C (read carbon twelve). By definition the atomic mass of a single 12 C atom is exactly 12 atomic mass units (denoted by the abbreviation amu or u). The masses of all other elements are based on this standard.
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ATOMS The atomic mass is the mass of an atom of an element. It is measured in Atomic Mass Units. A proton has a mass of 1 AMU. A neutron has a mass of 1 AMU. An electron has a mass of 0 AMU. The Atomic Mass of an element is shown on the period table.
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Atomic Weight Definition Atomic weight is the sum of the mass of the protons and neutrons of an atom. Science Photo Library-ANDRZEJ WOJCICKI, Getty Images.
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What is the difference between atomic mass and molar mass? Atomic mass is the mass of an atom and is given in a.m.u. (atomic mass unit). However, a molar mass is the mass of one mole atoms or molecules and is given in grams. one mole is equal to Avogadro's number (#N_A=6.022xx10^23#) atoms or molecules. For example: Sodium atom has a mass of 23 a.m.u. however, the molar mass of sodium is 23g/mol.