Nucleus of an element contains 9 protons. Its valency would be :

  1. A

    1

  2. B

    3

  3. C

    2

  4. D

    5

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    Solution:

    The element has an atomic number of 9 because it has nine protons in its nucleus. As a result, the element's electrical configuration is 2, 7. To reach the stable inert gas structure, it needs one additional electron. Its valency is thus 1.

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