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Which of the following atoms has the hig...

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

A

K

B

Sc

C

Rb

D

Na

Text Solution

Verified by Experts

The correct Answer is:
B
Alkali metals have the lowest ionization energy in each period on the other hand Sc is a d-block element.
Transition metals have smaller atomic radii and higher nuclear charge leading to high ionisation energy.
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