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Q.

For the alkali metals, which of the following increases with increasing atomic number?

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a

First ionization energy

b

Electronegativity

c

Hydration energy of the univalent ion

d

Atomic radius

answer is D.

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Detailed Solution

Atomic radius increases with increase in atomic number for the alkali metals.
Li < Na < K < Rb < Cs (Atomic radius)

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For the alkali metals, which of the following increases with increasing atomic number?