Comment on each of the following observations: (a) The mobilities of the alkali metal ions in aq...

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Comment on each of the following observations:
(a) The mobilities of the alkali metal ions in aqueous solution are
\[
\mathrm{Li}^{+}\mathrm{Na}^{+}\mathrm{K}^{+}\mathrm{Rb}^{+}\mathrm{Cs}^{+}
\]
(b) Lithium is the only alkali metal to form a nitride directly.
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