Question

In an atom it's last electron is filled in 4f. Find the period of the element?​

Answer 1

Explanation:

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Answer 2

The period number of the given element is SIX (6).

- The given element has last electron filled in its 4f subshell.

- The last electron is added in the 4f subshell in the lanthanide series.

- So, it is an element of inner transition metals (or Lanthanide Series).

- The lanthanide series is considered to be in the Sixth period.

- Hence, the period no is 6.