Why does てはいけない use は? I know it's a construction, but where did it come from? て form verbs are not nouns, it doesn't make sense to me that は could be used with them.
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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