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The atomic size of cerium and promethium...

The atomic size of cerium and promethium is. quite close, because

A

they are in same period in periodic table

B

their electronic configureation is same

C

f-electrons have poor shielding effect

D

nuclear charge is higher on cerium than promethium

Text Solution

Verified by Experts

The atomic size of cerium and promethium is quite close because f - electrons have poor shielding effect.
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