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Question=>A molecule of H2 exists while that of He2 does not exist.Explain?
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He2 does not exist because it is noble gas it doesn't form any bond except xenon, it exist in monoatomic while hydrogen can form bond to be stabilise.
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Heya....✋
Hydrogen atom has only one electron in its valence shells,i.e.,1s^1. The two such half filled atomic orbitals combine to form a molecular orbital having two electrons with opposite spins. They occupy such a position between the two nuclei so that the attractive forces increase. But helium atom has already a valence shell,i.e.,1s^2. Therefore, the atomic orbitals of the two atoms do not combine. Thus, a molecule of H2 exists while that of He2 does not.
Hope it helps✅
Hydrogen atom has only one electron in its valence shells,i.e.,1s^1. The two such half filled atomic orbitals combine to form a molecular orbital having two electrons with opposite spins. They occupy such a position between the two nuclei so that the attractive forces increase. But helium atom has already a valence shell,i.e.,1s^2. Therefore, the atomic orbitals of the two atoms do not combine. Thus, a molecule of H2 exists while that of He2 does not.
Hope it helps✅
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