The fourth, fifth and sixth periods are long periods and contain ……………
The fourth, fifth and sixth periods are long periods and contain ……………
(A) 18, 18 and 36
(B) 18, 28 and 32
(C) 18, 15 and 31
(D) 18, 18 and 32
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Correct option is: (D) 18, 18 and 32
First, second, third, fourth, fifth and sixth periods contain 2, 8, 8, 18, 18, 32 elements respectively. While seventh periods is incomplete
Hence, fourth, fifth and sixth period contain 18, 18, 32 element respectively.
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