(Answered) How many molecular orbitals can be built from the valence

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How many molecular orbitals can be built from the valence shell orbitals in H2?

Give the ground state electron configuration for these molecules and deduce its bond order.
H2 ^+
He2 ^+
He2 ^2+

Put the following species in order of increasing bond length, using molecular orbital theory:
H2 ^+
H2
He2 ^+
He2 ^2+
H2 ^-

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