How is it that many Teimanim wear long peyos (simanim) similar to many Chasidim, considering that their culture has been mostly isolated from Ashkenazi Europe? Do any historical sources tell us when and why their custom originated?
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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