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?

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) P2Q (C) P2Q3 (D) PQ2

Tardigrade Admin · Accepted Answer

Valence electrons in P is 2; Valence electrons in Q is 6. P - 2e- arrow P2+ Q +2e- arrow Q2- Since both show a valency of 2, the formula for the compound will be PQ.

Q. 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?

$PQ$

$P_{2} Q$

$P_{2} Q_{3}$

$P Q_{2}$

Valence electrons in $P$ is $2$ ; Valence electrons in $Q$ is $6$ .
$P - 2 e^{-} \to P^{2 +}$
$Q + 2 e^{-} \to Q^{2 -}$
Since both show a valency of $2$ , the formula for the compound will be $PQ$ .

Q. 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?

PQ

P2​Q

P2​Q3​

PQ2​