Question

There is a recurrence of properties after 2, 8, 8, $x$ and 32 elements in the periodic table. The value of $x$ is:

• A. 16
• B. 18
• C. 20
• D. 8

Answer 1

Answer: (B)

Electrons in various sub-orbits are filled in the increasing order of their energies as decided by Aufbau rule. $3d-$ sub-orbit is filled after $4s$; we can say that $3d$ is part of $4^{th}$ period. similarly $4d$ is part of $5^{th}$ period and so on.

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