Question

H2 molecules is exist but He2 is not​

Answer 1

Answer:

The two such half field atomic orbitals compbine to from a molecular orbital which contains both these electrons. But helium (Z=2) has already a filled orbital (1s2). Therefore, the atomic orbitals of the helium atoms donot combine. Thus, a molecule of H2 exists while that of He2 does not.

Explanation:

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Answer 2

Answer:

Because 'He' has full filled duplet therefore no need of forming bond and combining with another 'He' atom to form He2 molecule but this is not in H2 therefore it forms H2 molecule to complete its duplet .

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