Question

The number of protons in the nucleus of one atom of an element Y is 5. The symbol of ion formed by an atom of this element will be:
(a) Y³⁻
(b) Y²⁺
(c) Y²⁻
(d) Y³⁺

Answer 1

(d) Y³⁺
Number of protons is equal to number of electrons in an atom. Hence, electronic configuration of element Y is 2,3. Thus, it becomes stabilised by donating its 3 electrons to form Y³⁺.