Wednesday, October 4, 2017

gentiles - How should non-Jews observe Rosh HaShanah?


The second mishnah in Rosh HaShanah says that "all the people of the world" are judged on Rosh HaShanah. How should non-Jews observe the Day of Judgment?




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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{...