One atomic mass unit is equal to one-twelfth of the mass of an atom of carbon 12 isotope. 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”. 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 … Definition of Atomic Mass. :18 1 u has a value of 1.660 539 066 60(50) × 10 −27 kg. relative atomic mass synonyms, relative atomic mass pronunciation, relative atomic mass translation, English dictionary definition of relative atomic mass. Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard. However, because each atom has a very small mass, this is not very helpful. 1 atomic mass unit is defined as 1/12 of the mass of a single carbon-12 atom. Define relative atomic mass. Atomic mass definition: the mass of an isotope of an element in atomic mass units | Meaning, pronunciation, translations and examples 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. See more. Definition and Formula of Atomic Mass. In simple words, atomic mass is the mass of an atom of an element. 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. The atomic mass of an element is the average relative mass of its atoms as compared to an atom of carbon 12 taken as 12. 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. Learn more. 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. Symbol m. atomic mass atomic weight; see also atomic mass unit. Atoms are the basic units of matter. 2. that characteristic of matter that gives it inertia. mass [mas] 1. a lump or collection of cohering particles. 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. Atomic mass can be expressed in grams. 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