Ionisation potential in a period is lowest for-
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A.
Alkali metals
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B.
Halogens
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C.
Inert gases
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D.
Alkaline earth metals
Correct Answer:
A. Alkali metals
Explanation:
Alkali metals have the lowest ionisation potential in a period. This is because they have the largest atomic size in their respective periods, resulting in a weaker pull between the nucleus and the outermost electron. Consequently, the single valence electron is easily removed with minimal energy.
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