There is a Sefer written by someone named Yaakov Ben Yaakov Moshe called Magen HaElef. Is he Sefaradi or Ashekneazi?
Answer
This cover page says that he was from ליסא (modern-day Leszno) which makes him Ashkenazi.
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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