Question

Write three necessary conditions for the formation of a covalent bond

Answer 1

Covalent bond:

• A covalent bond is a chemical bond formed by the mutual sharing of electrons between atoms.
• The electrons are attracted by the atoms simultaneously.
• When the electronegativity difference between the two atoms is small then only covalent bond forms.

Condition:

• The electronegativity difference between the atoms that form a covalent bond must be equal.
• To establish a covalent bond, the forces of attraction between the atoms should be equivalent.
• Both atoms' ionisation energies must be high in order for electrons to be difficult to remove.
• When an atom loses or contributes one electron to form an electron pair, a covalent bond is formed.
• Each of the two participating atoms must have $5,6\&7$ electrons in their valence shells, or outermost shells, to form a covalent bond.