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13 October, 08:28

How many valence electrons are there in an atom with the electron configuration [noble gas]ns2 (n - 1) d10np3?

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  1. 13 October, 08:39
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    There are 5 valence electrons in Valence Shell.

    Example,

    Lets take example of Arsenic with Atomic Number 33.

    Its electronic Configuration is,

    [Ar] 4s², 3d¹⁰ 4p³

    As the valence shell number is 4, so all the electrons present in shell 4 are said to be valence shell electrons and they are 5 in number.
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