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The electronic configuration of an eleme...

The electronic configuration of an element `X` is `1s^(2),2s^(2),2p^(6),3s^(2),3p^(3)`. What is the atomic number of the element which is just below the element `X` in the periodic table?

A

33

B

34

C

31

D

49

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The correct Answer is:
A
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