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Which of the following atoms has the hig...

Which of the following atoms has the highest first ionisation energy ?

A

Na

B

K

C

Sc

D

Rb

Text Solution

Verified by Experts

The correct Answer is:
C
Due to poor shielding of d-electrons in eff Sc, `Z_("eff")` of Sc becomes more so that ionisation energy of Sc is more than Na, K and Rb.
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