Q.

The number of elements in the fourth period of the periodic table is

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a

8

b

18

c

32

d

64

answer is B.

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Detailed Solution

Fourth period involves the filling of 4s, 3d and 4p orbitals.  Thus, the number of elements in this period will be 2 + 10 + 6 = 18
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The number of elements in the fourth period of the periodic table is