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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 atom has only one shell (K shell) which can have maximum 2 electrons. Thus, its shell is already complete called duplet. It can neither lose electrons nor gain electrons. Hence, its valency is 'zero'. It is called noble gas or inert gas.
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Helium is a noble gas with 2 electrons in its outermost shell. Its valency is 0.

Knowledge Check

  • An element has 8 electrons in the valence shell

    A
    it will lose electron
    B
    it will gain an electron
    C
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    D
    it will make bond with itself

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    A
    6
    B
    8
    C
    2
    D
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