Question

All sodium atoms have 11 protons in the nuclei of sodium Adams contains 12 neutrons and others contain 11 these different forms of sodium are called?

Answer 1

Isotopes

Atoms of the same element; number of protons remain the same, number of neutrons vary. Chemical properties remain the same. Atomic mass varies.

Na sodium with 11 neutrons = atomic mass of 22

With 22 neutrons the mass is 23.

Both have 11 protons in the nucleus.