Sunday, July 8, 2018

riddle - Pidyon Haben Question




How is it possible to make a פדיון הבן by giving money to someone who is not a כהן?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

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{...