How to do covalent bonding in chemical reactions?

Covalent bonding in chemical reactions occurs when atoms share electrons to form stable molecules. This sharing of electrons creates a strong bond between the atoms. To form a covalent bond, atoms must have valence electrons available for sharing. The number of bonds formed depends on the number of valence electrons each atom has. The shared electrons are attracted to the positively charged nuclei of the atoms, creating a stable molecule.