Tuesday, March 28, 2017

halacha - stop benching at al-yichasiranu?



Can you stop benching (saying the grace after a meal) after al-yichasiranu (the end of the fourth blessing of the grace)?




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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{...