The quantum numbers, n=4, l=1, ml=0 could represent a valence electron in which atom in its ground state?

  1. A

    Fe

  2. B

    In

  3. C

    Pd

  4. D

    Se

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    Solution:

    Here,  

    n=1    l=0=(1s)n=2    l=0,1=(2s,2p)n=3    l=0,1,2=(3s,3p,3d)n=4    l=0,1,2,3=(4s,4p,4d,4f)

    designated by letters
    l=0 s orbital
    l=1 p orbital
    l=2 d orbital
    l=3 f orbital

    N=4 indicates that an atom is in its fourth phase
     l=1indicates P orbital .

    So, here the P-block element is Se.

    Hence, the option D is correct.

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