Elements A,B, C,D and E have following electronic configurations :

(A) 1s2,2s22p1 (B) 1s2,2s22p6,3s23p1 

(C) 1s2,2s22p6,3s23p3 (D) 1s2,2s22p6,3s23p5

(E) 1s2,2s22p6,3s23p6

Which among the belongs to  same  group in the periodic table?

  1. A

    A and C

  2. B

    A and D

  3. C

    A and E

  4. D

    A and B

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    Solution:

    The electronic configuration of Boron is,

    1s2,2s22p1
    The electronic configuration of Aluminum is,

    1s2,2s22p6,3s23p1

    Both belongs to same group in the periodic table.

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