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Which outcome occurs when electrons fill molecular orbitals?

A)Bond order increases, stabilising molecule
B)Paramagnetism decreases in all cases
C)Atomic radii always linearly increase
D)Ionisation energy decreases monotonically

💡 Explanation

Because bonding molecular orbitals are of lower energy, electrons preferentially fill these, participating in enhanced covalent bonding, this increases bond order and the molecular stability; therefore stability goes up rather than alternatives such as weaker interactions.

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