Question

The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion X²⁻?
(a) 8
(b) 9
(c) 10
(d) 11

Answer 1

(c) 10
Number of protons is equal to the number of electrons in an atom. It is given that one atom of an element X contains 8 electrons.
Therefore, number of electrons in its ion X²⁻ = 10 + 2 = 12