Q.

An atom X belongs to 4th period of the periodic table and has highest number of unpaired electrons in comparison to the other elements of the period. The atomic number of X is

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a

23

b

25

c

24

d

33

answer is C.

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Detailed Solution

The configuration of atom of 4th period with maximum unpaired electrons is 1 s22 s22p63 s23p63 d54 s1.Hence its atomic number is 24 .
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An atom X belongs to 4th period of the periodic table and has highest number of unpaired electrons in comparison to the other elements of the period. The atomic number of X is