Tuesday, January 24, 2017

number - why only 2 matzos used for seder by the Vilna Gaon


Why did the Vilna Gaon only use 2 matzos for his seder? The Rif also did that-- why?




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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{...