Best Answer

i. According to this theory proposed by Heitler and London and developed by Linus Pauling and Slater. 

ii. For the formation of a covalent bond, a half – filled atomic orbital of one atom overlaps with the half – filled atomic orbitals of another atom. These atomic orbitals belong to the outermost shell of the atoms. 

iii. A covalent bond is formed by the overlapping of atomic orbitals having electrons with opposite spins. 

iv. The atomic orbitals containing paired electrons do not participate in the processes of overlapping. These electrons are called non – bonding electrons. 

v. Due to the directional nature of most of the orbitals, overlapping is possible only when orbitals are properly oriented. 


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