Valence electrons are present in the:

Correct option is D

Valence electrons are present in the outermost shell of an atom.
· Valence electrons are the electrons found in the outermost energy level or shell of an atom.
· These electrons are involved in chemical reactions and interactions with other atoms, and they determine an element's chemical properties and its ability to form chemical bonds.
· Valency is simply equal to the number of electrons gained, lost or shared by an atom of an element to achieve the nearest noble gas configuration. For example, the valency of sodium (Na) is 1, magnesium (Mg) is 2, Chlorine (Cl) is 1 etc.