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The s-Block Elements
Discuss the general trends in atomic and ionic radii of alkali metals.
The atoms of alkali metals have the largest size in their respective periods. The atomic radii increase on moving down the group among the alkali metals.
Reason: On moving down the group, there is a progressive addition of new energy shells. Although, the nuclear charge also increases down the group yet the effect of the addition of new shells is more predominant.
The radii of positive ion are smaller as compared to that of parent atom. Within the group, the ionic radii increase with the increase in atomic number.
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The softness of group 1 elements increases down the group with increasing atomic number. Give reason.
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?
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