____________ possess the lowest first ionization energy in their respective period.

Alkali metals

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Alkaline earth metals

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Noble gases

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Halogens

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Solution

The correct option is C Alkali metals
Alkali metals are group one elements with only one electron in its outermost valency shell, as we move from left to right number of electrons in valence shell increases and volume decreases, hence value of first ionisation energy of alkali metals is lowest in their respective period.

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