Question

Can any one explain me the atomic number , mass number

Answer 1

atomic number is the number of protons in the atom/nucleus.

mass number is the sum of protons and neutrons.

Answer 2

Answer:

• Mass number is always an integer.

The atomic mass reported on a periodic table is the weighted average of all the naturally occuring isotopes.

Being an average it would be most unlikely to be a whole number.

The mass of an individual atom in atomic mass units is the mass relative to carbon-12.