Who knows seven?
(I mean really, who doesn't?)
Please cite/link your sources, if possible. In about one business day, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
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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