Question

The number of valence electrons in the atoms of carbon, nitrogen and oxygen respectively are __________.

• A. 4, 2 and 3
• B. 4, 5 and 6
• C. 4, 3 and 2
• D. 6, 7 and 8

Answer 1

The correct option is B 4, 5 and 6

Valence electrons are the electrons present in the outermost shell of an atom.
The atomic numbers of cabon, nitrogen, oxygen respectively are 6, 7 and 8. $$\begin{array}{cccc}\text{Element}& \text{Atomic no.}& \text{Electronic configuration}& \text{No. of valence electrons}\\ \text{Carbon}& \text{6}& \text{2,4}& \text{4}\\ \text{Nitrogen}& \text{7}& \text{2, 5}& \text{5}\\ \text{Oxygen}& \text{8}& \text{2, 6}& \text{6}\end{array}$$