I read here about certain Jewish sects prescribing face veil. Is there, in fact, a rule requiring or encouraging covering the faces of women in presence of unrelated men? If so, what is the source for this rule?
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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