When comparing Be2 and H2:

I. Be2 is more stable because it contains both bonding and antibonding valence electrons.
II. H2 has a higher bond order than Be2.
III. H2 is more stable because it only contains 1s electrons.
IV. H2 is more stable because it is diamagnetic, whereas Be2 is paramagnetic.

H2 has a bond energy of 1 while Be2 has a bond energy of zero. Be2 has 8 electrons which occupy four orbitals. Two of them are bonding molecuar molecular orbitals and the other two are antibonding molecular orbitals. The molecule is thus unstable. H2 has only two electrons which occupy the sigma 1s bonding molecular orbital having a bond order of 1. Hence it is a stable molecule.

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When comparing Be2 and H2: I. Be2 is more stable because it contains both bonding and antibonding valence electrons. II. H2 has a higher bond order than Be2. III. H2 is more stable because it only contains 1s electrons. IV. H2 is more stable because it is diamagnetic, whereas Be2 is paramagnetic.

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When comparing Be2 and H2:

I. Be2 is more stable because it contains both bonding and antibonding valence electrons.
II. H2 has a higher bond order than Be2.
III. H2 is more stable because it only contains 1s electrons.
IV. H2 is more stable because it is diamagnetic, whereas Be2 is paramagnetic.