Thursday, July 27, 2017

parshanut torah comment - 400 Years in Egypt (?)



I know that Samuel David Luzzatto (1800-1865) said that we served all 400 years in Egypt as opposed to just 210. Are then any other "famous" commentators that say this?




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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{...