Thursday, September 28, 2017

product recommendation - Lectures on "Shemiras Einayim"


Would anyone know of any online lectures on the inyan of Shemiras Einayim in English ( preferably lectures that I could download. )




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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{...