Tuesday, October 10, 2017

passover seder hagada - Why do we sing "Echad Mi Yodeya"?


Why do we sing the song "Echad Mi Yodeya" at the seder?




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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{...