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. $PQ_{2}$

Answer 1

Answer: (A)

PQ

Answer 2

: Valence electrons in P is 2, valence electrons in Q is 6.

$P - 2e^{-} \rightarrow p^{2 +}$

$Q - 2e^{-} \rightarrow Q^{2 -}$

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