How many neutrons are present in the nucleus of Sodium ?

The electronic configuration of an atom is 1s^2 2s^2 2p^6 3s^2 . Determine its atomic number. How many neutrons are present in the nucleus if its atomic weight is 24.

An atom has mass number A and atomic number Z. How many neutrons are present in its nucleus ?

An element has electronic configuration 2, 8, 18, 1. If its mass number is 63, then how many neutrons will be present in the nucleus of the atom?

The atomic number of sodium is 11 How many protons are there in the nucleus of a sodium atom