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 Form 2 Chemistry Questions and Answers on Chemical Families

The plots below were obtained when the atomic radii of some elements in group I and II were plotted against atomic numbers.
plots942020847.png
Explain:
(a) The trend shown by Li ,Na and K
(b) Why the atomic radii of elements Be ,Mg and Ca are lower than of Li ,Na and K

 (5m 32s)
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