I've heard that Rabeinu Gershom (a 10th-11th century scholar) banned 3 things, and I know one of them is polygamy. Does anyone know what the other two are?
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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