Tuesday, September 12, 2017

halacha - Sharpening a knife as Ne'itzah/Kelipah


Can sharpening a knife be done as a form of Ne'itzah for removing a Kelipah for Kashruth concerns?




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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{...