the weight of an atom as expressed in atomic mass units (amus).

The mass of an atom, most often expressed in unified atomic mass units.

A mass unit determined by arbitrarily assigning the carbon-12 isotope a mass of 12 atomic mass units. atomic nucleus

The average mass of all isotopes of an element, taking their natural relative proportions into account. For example, chlorine has two main isotopes – 37Cl and 35Cl. In naturally occurring chlorine, 75% is 35Cl and 25% is 37Cl. Therefore, the weighted average (atomic mass) is 35.5.

The average mass (in atomic mass units, u) of an atom of the element in naturally occurring samples.

[noun] The average mass of an atom of an element, usually expressed in atomic mass units. The term is often used interchangeably with atomic weight. Appears in modules:

average of the masses of all the existing isotopes of an element. atomic mass unit (amu)

The sum of protons and neutrons in the nucleus of an atom; mass number (Lessons 8, 9)

The number of nucleons (protons and neutrons) in the atomic nucleus.

the mass of an atom expressed in atomic mass units (amu); the total number of protons and neutrons in the nucleus.

The atomic mass is the total mass of one atom of an element. It is the mass of the protons, electrons, and neutrons combined. The mass of all atoms is based on the mass of carbon. Carbon's mass i [..]

The mass of one atom of an element

Number of protons plus neutrons in the nucleus of an atom.

The mass of a single atom.

The atomic mass represents the total number of Protons & Neutrons in an atom. For example, in the Carbon 14 atom shown above there are 6 (red) Protons and 8 (blue) neutrons packed into the nucleus [..]