Question

(a) The atomic number of sodium is 11. What is the number of electrons in $N{a}^{+}$?
(b) the atomic number of chlorine is 17. What is the number of electrons in $C{l}^{-}$?

Answer 1

Answer :

(a) $N{a}^{+}$ contains one less electron than the Na atom (11 electrons). So it contains 11 − 1 = 10 electrons.
(b) $C{l}^{-}$​​​​​​​ contains one more electron than the Cl atom (17 electrons). So it contains 17 + 1 = 18 electrons.