SSC MTS EXAM

Detailed explanation-1: -Only the electrons present in the outermost shell can participate in the formation of a chemical bond or a molecule. Such type of electrons is called valence electrons.

Detailed explanation-2: -The outermost electrons surrounding an atom (the valence electrons) are responsible for the number and type of bonds that a given atom can form with other atoms, and are responsible for the chemistry of the atom.

Detailed explanation-3: -Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.