Periodic Classification And Periodic Properties Ques 40
Arrange the following ions in order of their increasing radii $\mathrm{Al}^{3+}, \mathrm{Mg}^{2+}, \mathrm{Li}^{+}, \mathrm{K}^{+}$.
(1997, 1M)
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Solution:
- $\mathrm{K}^{+}<\mathrm{Mg}^{2+}<\mathrm{Al}^{3+}<\mathrm{Li}^{+}$. Size decreases from left to right in a period and it increases from top to bottom in a group. Variation is more pronounced in group than in period.
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