Which of the following has the highest first ionization energy in its period?

Alkali metal

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Alkaline earth metal

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Transition metal

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Halogen

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Noble gas

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Solution

The correct option is D Noble gas
Noble gases or inert gases like He,Ne,Ar,Kr have stable electronic configuration due to completion of their octet.This stability raises the ionization energy required to remove the outer electron.So all the noble gases have high ionization energy.

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