Negations that consistently take -ない in the plain form show differences in the polite version:食べない -> 食べませんで(は)ない -> で(は)ありませんbut大きくない -> 大きくないです
Why the inconsistency? Is it due to history?
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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