Question

The element which has the maximum number of valence electrons is:

• A. $Na$
• B. $P$
• C. $Si$
• D. $Al$

Answer 1

The correct option is B $P$

Valence electrons are the electrons present in the outermost shell.
Electronic configuration of the given element is:
$Na:1s^{2}2s^{2}2p^{6}3s^{1}P:1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}Si:1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}Al:1s^{2}2s^{2}2p^{6}3s^{2}3p^1$
Thus, phosphorous has the maximum number of valence electrons, i.e., $5$.