Select correct statement (s):

Options

A. Across a transition series (from `Cr` to `Cu)`, there is only a small change in atomic radius from one element to another due to very small change in effective nuclear charge.
B. The rate of decrease in the size across the lanthanide series is less than the across the first transition series.
C. Both are correct statements
D. None of the statement is correct.

Answer

C

Explanation

(A) Successive addition of d-electron screen the outermost electron `(4s)` from the inward pull of the nucleus. As a result of this, the size of the atom does not change much from `Cr to Cu`.
(B) This is due to lanthanide contraction.