Question

(a) The atomic number of sodium is 11. What is the number of electrons in Na+?
(b) The atomic number of chlorine is 17. What is the number of electrons in Cl−?

Answer 1

Answer:

A neutral sodium atom, for example, contains 11 protons and 11 electrons. By removing an electron from this atom we get a positively charged Na+ ion that has a net charge of +1. Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons