Wednesday, May 17, 2017

parshanut torah comment - Why is every 3rd plague (of the 10 brought on Pharoah) unannounced?


It seems like Moshe warned Pharoah of every plague except the 3rd (lice), 6th (boils) and 9th (darkness). Why is that? Is there something special about these plagues?




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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{...