# The electronic configuration of an element is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{3}$ . What is the atomic number of the element which is just below the above element in the periodic table?

1. A

34

2. B

49

3. C

33

4. D

31

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### Solution:

The element is arsenic.

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