Is Rashi on the Rif the same as the one in the Gemara?
If it is, why is it put there?
If its not, then why did Rashi write a different pirush on the Rif, and does it have a different Derech then Rashi on the Gemara?
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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