I have an unstemmed kiddush cup with Hebrew inscriptions on the inside. I am told that it is from Rabbi Hashrash and refers to the 4 rivers of Eden. Do you know the story behind this?
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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