A) they are in same period in periodic table
B) their electronic configuration is same
C) \[f-\]electrons have poor shielding effect
D) nuclear charge is higher on cerium than promethium
Correct Answer: C
Solution :
The size of cerium and promethium is quite close due to poor shielding effect of \[f-\]electrons.
You need to login to perform this action.
You will be redirected in
3 sec
