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Ionization Enthalpy

Which element...

Question

Which element has the largest first ionization energy?

A

K

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B

C a

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C

B r

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D

K r

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E

Z n

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Solution

The correct option is D $K r$
Since, Kr has the smallest size among the elements. The valence electron is much closer to the nucleus. So, it is difficult to pull the electron out. Hence, it has the largest first ionization energy.

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