Periodic Classification and Periodic Properties 2 Question 43
43. Arrange the following ions in order of their increasing radii $\mathrm{Li}^{+}, \mathrm{Mg}^{2+}, \mathrm{K}^{+}, \mathrm{Al}^{3+}$.
(1997, 1M)
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Solution:
- $\mathrm{Li}^{+}<\mathrm{Al}^{3+}<\mathrm{Mg}^{2+}<\mathrm{K}^{+}$. 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.
