Wednesday, September 12, 2018

passover - Why do the first born fast on erev Pesach?


What is the logic behind the first born fasting on erev Pesach? Is it a form of celebration? If so, would not a feast be better? Is it a form of teshuva? If so, for what sin? Is it a form of thanks? If so, by what logic is a fast a form of thanks? Also, why is the fast limited to the first born? None of us alive today were personally passed over.




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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{...