Which of the following is the period number of the element whose atomic number is 98

Options

A. 4
B. 7
C. 5
D. 6

Answer

B

Explanation

The electronic configuration of the element with atomic number 98 is as follows
`1s^(2),2s^(2),2p^(6),3s^(2),3p^(6),4s^(2),3d^(10),4p^(6),5s^(2),5p^(6),6s^(2),4f^(14),5d^(10),6p^(6),7s^(2),5f^(10)` The last electron enters in f orbital, so it belongs to f block in the period.