Sunday, March 5, 2017

halacha - Sitting shiva for non-Jewish relatives?



Should one sit shiva for a non-Jewish relative? Say your mother is Jewish and your father is not, and he dies.




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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{...