I have a question about the following sentence:
お母さんが、八百屋で長いこと、何を買うか決まらず迷っています。
Is it possible to replace "か" with "のか" without misunderstanding in this sentence? Namely,
お母さんが、八百屋で長いこと、何を買うのか決まらず迷っています。
Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...
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