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Electronic Configuration of Actinides

Write the ord...

Question

Write the order of alkali metals according to the atomic radii.

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Solution

Atomic radii of alkali metal increases down the group.
So, the atomic radii increase from lithium to ceasium.
$C s > R b > K > N a > L i$ [Atomic radii]

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Q. The atomic radii of alkali metals decreases as we go down the group.

Q. Atomic radii of alkali metals (M) follow the order

L i < N a < K < R b

but ionic radii in aqueous solutions follow the reverse order

L i^{+} > N a^{+} > K^{+} > R b^{+}

The reason for the reverse order is :

Q. Assertion :Alkaline earth metals have lower densities than alkali metals. Reason: Atomic radii of alkaline earth metals are larger than that of corresponding alkali metals.

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

The ionic radii of alkali metal ions in water (hydrated radii) are in the order

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