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Q.

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

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a

Na

b

Rb

c

Sc

d

K

answer is D.

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Detailed Solution

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Going down the group, ionization energy decreases and moving across a period ionization energy increases, so scandium has the highest ionization energy.

And also due to the poor shielding of d-orbital, the Zeff for Sc becomes high, and hence the ionisation energy is high.

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