Thursday, May 17, 2018

product recommendation - Looking for a good online book for shemira einayim


anyone know of a good reliable online book for studying the matter of shemiras einayim (guarding the eyes)? (halachas/mussar. something like the chafetz chaim's book on shemira halashon)




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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{...