Monday, September 25, 2017

sources mekorot - Hashem and Arabs


Someone quoted to me a Gemara in Sukkah which said that Hashem had charata that He created arabs. What daf in Sukkah is that on?




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

Apparently the of last four, MgX2+ is closest in radius to LiX+. Is this true, and if so, why would a whole larger shell ($\ce{...