Question

define atomic mass unit​

Answer 1

ATOMIC MASS :

• The concept of atomic mass could explain the " law of constant proportions ".
• Atomic mass was determined by using " law of chemical combination " and the compounds formed.
• initially scientist considered 1 / 6 th of oxygen atomic mass as a unit.

Reasons for considering oxygen :

1. Oxygen reacted with many elements to form compounds.
2. its atomic mass give atomic masses of other elements in whole numbers.

• Later 1 / 12 th of carbon atomic mass was considered as one atomic mass unit of an atom.

HOPE IT HELPS YA'

Answer 2

An atomic unit of mass is defined as accurately 1/12 the mass of a carbon-12 atom. The carbon-12 atom has six neutrons and six protons in its nucleus.

The atomic unit mass is symbolized as AMU or amu.

1 AMU = Average of the proton rest mass and the neutron rest mass.