Valency of Hydrogen and Helium
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Valency of Helium is 0 and Valency of Hydrogen is 1
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Hydrogen is a unique atom, because it has only two spots in its outermost electron level.Helium has two electrons and exhibits the properties of a noble gas.
Hydrogen valence number is one, because it has only one valence electron and needs only one shared electron to fill it's energy levels.
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