Ionisation energy in the alkali metals group :

increases from Li to Cs

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decreases from Li to Cs

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remains the same

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first increases then decreases

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Solution

The correct option is B decreases from Li to Cs
IE decreases on moving down the group as the atomic radii increases and the outer electrons moves farther away from nucleus and the electron is not tightly bound to nucleus.

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L i

L i

N e ?

The atomic radii of alkali metals (M) lie in the order \(Li < Na < K

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