Question

The total number of electrons in a nitrogen atom and a chlorine atom are $7$ and $17$ respectively. Find the number of valence electrons in them.

• A. $3,1$
• B. $5,8$
• C. $4,1$
• D. $5,7$

Answer 1

The correct option is D $5,7$

The electronic configuration of nitrogen is $2,5$ and so, has $5$ valence electrons.

Similarly, the electronic configuration of chlorine is $2,8,7$, and the last shell has 7 electrons. Thus it has $7$ valence electrons. The answer is option D.