I read somewhere that bar mitzvah and wedding invitations should not contain pesukim. If one receives a bar mitzvah or wedding invitation that contains pesukim and throws it into the garbage, has the sender transgressed lifnei evair?
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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