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Q.

The electronic configuration of an element(X) is 1s22s22p63s23p3 . What is the atomic number of the element which is just below ‘X’ in the modern periodic table

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a

33

b

34

c

31

d

49

answer is A.

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Detailed Solution

Given element is Phosporus atomic number Z = 15Element below ‘P’ in that group = 15 + 18 = 33.
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