Why hydrogen is diatomic but helium is not
المؤلف:
Jonathan Clayden , Nick Greeves , Stuart Warren
المصدر:
ORGANIC CHEMISTRY
الجزء والصفحة:
ص91
2025-04-26
699
Like H atoms, He atoms have their electrons in 1s orbitals, so we can construct an energy level diagram for He2 in a similar way. But there is one big difference: each helium atom has two electrons so now both the bonding MO and the antibonding MO are full! Any bonding due to the electrons in the bonding orbital is cancelled out by the electrons in the antibonding orbital, and the He2 molecule falls apart. He2 does not exist.

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