Question

Define atomic mass and mass number​

Answer 1

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Question => Define atomic mass and mass number .

=> Atomic mass - The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.

Which means one atom is given a relative atomic mass of exactly 12. Atomic mass is not reported with units. The formula for atomic mass is given below. Atomic mass = Mass of protons + Mass of neutrons + Mass of electrons.

=> Mass number - Mass number, in nuclear physics, the sum of the numbers of protons and neutrons present in the nucleus of an atom.

The mass number of an atom is its total number of protons and neutrons. Atoms of different elements usually have different mass numbers , but they can be the same. For example, the mass number of argon atoms and calcium atoms can both be 40.