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The S-Block Elements

Question
CBSEENCH11007069
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The ionic radii of alkali metal ions in aqueous solution follows the order Li+ > Na+> K+ > Rb+ > Cs+ Justify the above order.

Solution
The alkali metal ions get extensively hydrated in aqueous solutions. Smaller is the size of the ion more is the extent or degree of hydration. Thus, as a matter of fact, the ionic radii in water decrease from Li+ to Cs+ i.e. the ion which should have been the smallest is actually the largest in size in water.

Some More Questions From The s-Block Elements Chapter

Which is the most reactive alkali metal and why?

Why alkali metals do not form M2+ ions?

Name the radio active element in group 1. How does it resemble with the remaining elements of the group?

Why alkali metals are normally kept in kerosene oil?

Why lithium cannot be stored in kerosene?

Why does lithium form complexes?

Why are alkali metal ions diamagnetic and colourless?

Why are alkali metals the most electropositive in nature?

Explain why is sodium less reactive than potassium.

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