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Atomic mass units are often used to describe an element’s atomic weight, which is the weighted average of the atomic masses of an element’s naturally occurring isotopes.
: a unit of mass for expressing masses of atoms, molecules, or nuclear particles that is equal to ¹⁄₁₂ of the atomic mass of the most abundant kind of carbon
The "unified atomic mass unit" is a physical constant that is accepted for use in the SI measurement system. It replaces the "atomic mass unit" (without the unified part) and is the mass of one nucleon (either a proton or a neutron) of a neutral carbon-12 atom in its ground state.
Atomic mass is often measured in dalton (Da) or unified atomic mass unit (u). One dalton is equal to 1 ⁄ 12 the mass of a carbon-12 atom in its natural state. Thus, the numeric value of the atomic mass when expressed in daltons has nearly the same value as the mass number.
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). 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.
Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units. In this scale, 1 atomic mass unit (amu) corresponds to 1.66 x 10^−24 gram.
The atomic mass is an average of an element’s atomic masses, weighted by the natural abundance of each isotope of that element. It is a weighted average because different isotopes have different masses. An atomic mass unit is 1/12th of the mass of a 12 C atom.
A unified atomic mass unit (u) is a standard unit of measurement used in biology to express the mass of atoms and molecules, where one u is approximately equal to the mass of a proton or neutron.
Atomic weight, ratio of the average mass of a chemical element’s atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. Atomic weight is measured in atomic mass units (amu), also called daltons.
Atomic mass is most conveniently described by the atomic mass unit, which is 1/12 of the mass of a carbon-12 atom. This means that each proton and each neutron contribute 1 amu to the mass of an atom, which makes it very easy to calculate. You can also use this to account for different isotopes.