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Helium atom has 2 electrons in its valen...

Helium atom has 2 electrons in its valence shell but its valency is not 2. Explain.

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Helium (He) atom with atomic number (z) equal to two only oe shell (K-shell) .It can have a maximum of two electrons which it has .Therefore the valence shll is complete and valency of the atom is zero
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