Question

Two elements P and Q combine to form a compound. If P has $2$ and Q has $6$ electrons in their outermost shell, what will be formula of the compound formed?

• A. $PQ$
• B. $P_{2}Q$
• C. $P_2{Q}_3$
• D. $P{Q}_2$

Answer 1

Answer: (A)

$PQ$

Valence electrons in P is 2; Valence electrons in Q is 6.

$P-2e^{-}\to P^{2+}$

$Q+2e^{-}\to Q^{2-}$

Since both show a valency of 2, the formula for the compound will be $PQ$.

Hence, the correct answer is option $\text{A}$.