The species A r , K + and C a 2 + contain the same number of electrons. In which order do their radii…

1. $\mathrm{A}\mathrm{r}<{\mathrm{K}}^{+}<\mathrm{C}{\mathrm{a}}^{2+}$
2. $\mathrm{C}{\mathrm{a}}^{2+}<\mathrm{A}\mathrm{r}<{\mathrm{K}}^{+}$
3. $\mathrm{C}{\mathrm{a}}^{2+}<{\mathrm{K}}^{+}<\mathrm{A}\mathrm{r}$
4. ${\mathrm{K}}^{+}<\mathrm{A}\mathrm{r}<\mathrm{C}{\mathrm{a}}^{2+}$

Solution

Asked in: NEET 2015 (Phase 1)

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