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Atomic Mass Number Source: chemwiki.ucdavis.edu. Atomic mass of an element is the number of times an atom of that element is heavier than an atom of carbon taken as 12. One atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope. relative atomic mass synonyms, relative atomic mass pronunciation, relative atomic mass translation, English dictionary definition of relative atomic mass. The Gold Book of the International Union of Pure and Applied Chemistry (IUPAC) defines atomic mass as “rest mass of an atom in its ground state”. Atomic number is used to define the type of element a material or substance is.It is the number of protons present in an element’s nucleus. Definitions Element showing its atomic number and mass number. Atomic mass unit definition, a unit of mass, equal to 1/12 (0.0833) the mass of the carbon-12 atom and used to express the mass of atomic and subatomic particles. Define relative atomic mass. Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard. Atomic mass can be expressed in grams. 2. that characteristic of matter that gives it inertia. There is a difference between the meanings of the chemistry terms atomic mass and mass number.One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. Symbol m. atomic mass atomic weight; see also atomic mass unit. n the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12. inner cell mass an internal cluster of cells at the embryonic pole of the blastocyst which develops into the body of the embryo. atomic mass definition: 1. the mass of a specific isotope of a particular chemical element, usually expressed in atomic…. Definition of Atomic Mass. In simple words, atomic mass is the mass of an atom of an element. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons.The nucleus is composed of protons and neutrons.The total number of protons and neutrons in the nucleus of an atom is called the atomic mass number (or the mass number) of the atom and is given the symbol A. Definition and Formula of Atomic Mass. See more. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12.An isotope is one of two or more species of atoms of the same chemical element that have different atomic mass numbers (protons + … The atomic mass, on the other hand, is the number of both the protons and neutrons present in the nucleus of the element.Electrons do not usually weigh much, so the atomic mass … However, because each atom has a very small mass, this is not very helpful. mass [mas] 1. a lump or collection of cohering particles. 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