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Q.
Which of the following statement (s) is/are true for $IA$ elements?
Classification of Elements and Periodicity in Properties
Solution:
(a) $s$ and $p$ - block elements are collectively called as representative elements.
(b) As metallic character, i.e., electropositive character increases, the basic nature of metal oxides increases.
(c) Hydration $\alpha \frac{\text { Charge on cation }}{\text { Size of cation }}$
(d) As the size of atom increases, the distance between nucleus and extra electron increases and thus attraction between them decreases. Hence, generally electron affinity decreases (exception third period elements).