Question

15. Define atomic mass unit. State how do atoms exist?
Ans:​

Answer 1

Answer:

Atomic mass unit (amu) is defined as the mass unit equal to exactly 1/12th of the mass of one atom of C-12 isotope. Atom may exists independently in free state (e.g. He, Ne and Ar) or in combined state.

Answer 2

Define atomic mass unit.

=> A precisely 1/12 the mass of an atom of carbon-12.

State how do atoms exist?

=> Atoms of most of the elements exist in the form of molecule or ion.

For example: hydrogen, oxygen & chlorine.