Which of the following increases in magnitude as the atomic number of alkali metals increases?

Electronegativity

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First ionisation potential

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Ionic radius

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Melting point

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Solution

The correct option is D Ionic radius
Alkali metals can readily lose their lone electron to form a $+ 1$ oxidation state and can easily ionize this electron and this $n s^{1}$ configuration results in alkali metals having large ionic and atomic radii.

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Magnitude of which of the following property of alkali metals increases with the increase of atomic number

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

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