Monday, January 16, 2017

history - Was Marcus Jastrow an apikores?


During Yeshiva I remember some bochrim made a point of not putting the Jastrow dictionary on top of sefarim, and would often talk about how it does not have kedusha because it was written by an apikores. Was Marcus Jastrow really an apikores?




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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{...