Chemistry Practice Problems Homonuclear Diatomic Molecules Practice Problems Solution: Energy-level diagram for the He2+ ion.Which electr...

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Solution: Energy-level diagram for the He2+ ion.Which electrons in this diagram contribute to the stability of the He2+ ion?

Problem

A diagram shows an He atom with two electrons in its 1s orbital and an He+ ion with one electron in its 1s orbital.  The higher energy antibonding MO (sigma*1s) has one electron in it, while the lower energy He2+ ion bonding orbital (sigma1s) is full (two electrons).
Energy-level diagram for the He2+ ion.

Which electrons in this diagram contribute to the stability of the He2+ ion?

Solution

Recall: The bond order determines the stability of a molecule based on it's molecular orbital diagram.

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