Question

How many valence electrons are there in the following electronic configuration?

$1s^{2}2s^{2}2p^{6}3s^{2}3p^2$

• A. $6$
• B. $5$
• C. $4$
• D. $3$
• E. $2$

Answer 1

The correct option is C $4$

The number of electrons in an atom's outermost shell are called valance electrons that participate in the formation of a chemical bond. The atom with electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^2$ has $4$ valance electrons in outermost shell. These include $3s^{2}3p^2$ electrons.