Question

Match the elements with their respective number of valence electrons:

• A. 4
• B. 2
• C. 1
• D. 6

Answer 1

The number of electrons present in the outermost shell of an atom is called valence electrons.

Elements with their atomic number, electronic configuration and number of valence electrons are given below:

$$\begin{array}{cccc}\text{Elements}& \text{Atomic number}& \text{Electronic configuration}& \text{Number of valence electrons}\\ \text{Hydrogen}& \text{1}& \left(1\right)& 1\\ \text{Helium}& \text{2}& \left(2\right)& 2\\ \text{Carbon}& \text{6}& (2,4)& 4\\ \text{Oxygen}& \text{8}& (2,6)& 6\end{array}$$