Question

Atomic weight are expressed in a. m. u. Give reason​

Answer 1

Answer:

• It is a unit of mass used to express atomic masses and molecular masses. When the mass is expressed in AMU, it roughly reflects the sum of the number of protons and neutrons in the atomic nucleus (electrons have so much less mass that they are assumed to have a negligible effect).

Answer 2

Explanation:

In chemistry, an atomic mass unit or AMU is a physical constant equal to one-twelfth of the mass of an unbound atom of carbon-12.

It is a unit of mass used to express atomic masses and molecular masses.

When the mass is expressed in AMU, it roughly shows the sum of the number of protons and neutrons in the nucleus (electrons have so much less mass that they are assumed to have a negligible effect).

The symbol for the unit is u (unified atomic mass unit) or Da (Dalton), although AMU may still be used.

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