In order to make a siyum on a mesechta, does one have to leave over the last piece for the siyum, & if not, how soon after completing the masechta does one have to make the siyum?
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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