Arrange the following element in increasing order of atomic radii: (a) \( \mathrm{Na}\mathrm{K}\...

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Arrange the following element in increasing order of atomic radii:
(a) \( \mathrm{Na}\mathrm{K}\mathrm{Mg}\mathrm{Rb} \)
(b) \( \mathrm{K}\mathrm{Na}\mathrm{Mg}\mathrm{Rb} \)
(c) \( \mathrm{Mg}\mathrm{Na}\mathrm{K}\mathrm{Rb} \)
(d) \( \mathrm{Rb}\mathrm{K}\mathrm{Mg}\mathrm{Na} \)
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