Question

An atom with $3$ protons and $4$ neutrons will have a valency of

• A. $3$
• B. $7$
• C. $1$
• D. $4$

Answer 1

The correct option is C

$1$

The explanation for the correct option

(C)$1$

Step1. Calculation of number of electrons

• In a neutral atom:-
• $\text{Number of protons =Number of electron}$
• So, the number of electron is $3$.

Step2. Valency of atom

• The electronic configuration of the given atom is $1s^{2}2s^1$.
• The valency of a given atom is one because it can donate one electron and gets a stable electronic configuration.
• So, the valency of atom is $1$.

The explanation for incorrect option

The valency of the atom is $1$. Hence, the options (A), (B), and (D) are incorrect.

Hence, the correct option is (C). The valency of the atom is $1$.