Covalent bonds are formed in order to: completely fill the shells of the atoms fill the s and p subshells of the outer shell form ions which attract each other other
Covalent bonds are interatomic bonds which results from the sharing of electrons between two or more atoms. Each of the atoms tends to share the valence electrons in their outer energy levels to be able to mimic the structure of the noble gases.
Usually, this bond type results from two atoms whose electronegativity difference is very low or even zero.
