Question

define atomic mass unit

Answer 1

Unit for atomic mass is called atomic mass unit or amu. It is 1/12th the mass of an atom of carbon-12.

Answer 2

Atomic mass unit:

• It is the unit of mass used to show the atomic as well as molecular mass of the matter which is equal to the one-twelfth mass of an atom of Carbon. An 'atomic mass unit' is symbolized as AMU.
• In fact, one AMU is average value of the 'proton rest mass' and the 'neutron rest mass'. Electrons are totally neglected because of their less size. An Atomic mass unit is a constant and fundamental unit.

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