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Ionization Energies

Which of the ...

Question

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

A

N a

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B

K

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C

S c

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D

R b

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Solution

The correct option is C $S c$
$S c$ , due to the poor shielding of d-orbital, the Zeff for $S c$ becomes high, and hence the ionisation energy is high.

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