An element z has an electronic configuration : ns2np6(n1)d10(n2)f14. Which value of n is not possible

  1. A

    6

  2. B

    3

  3. C

    5

  4. D

    Both (b) and (c)

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    Solution:

    For n=6,

    6s2,6p6,5d10,4f4

    This is a possible electronic configuration.

    For n=3,

    3s2,3p6,(31)d10(32)f143s2,3p6,2d10,1f14

    This is not possible.

    For n=5,

    5s2,sp64d103f14

    This is not possible.

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