Q.

The electronic configuration of an element 'X', is 1s2 2s2 2p6 3s2 3p3. What is the atomic number of the element which is just below 'X' in the periodic table

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a

33

b

34

c

31

d

49

answer is A.

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Detailed Solution

P(Z=15)...1s22s22p63s23p2Next element of the group will have the atomic number 15+18=33
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