Sunday, September 30, 2018

tefilla - Specific things to do when a Gadol passes away


Are there are any Segulot, Tefilot, Limudim brought down in the Sefarim for the passing of the Sadik HaDor?




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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{...