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Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals. 

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The given conditions should be satisfied by atomic orbitals to form molecular orbitals: 

(a) The combining atomic orbitals must have the same or nearly the same energy. This means that in a homonuclear molecule, the 1s-atomic orbital of an atom can combine with the 1s-atomic orbital of another atom, and not with the 2s-orbital. 

(b) The combining atomic orbitals must have proper orientations to ensure that the overlap is maximum. 

(c) The extent of overlapping should be large. 

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