Saturday, October 14, 2017

What do chazal mean when they guarantee someone Olam Habah?



What does it mean when the Gemara guarantees a person Olam Habah for doing a certain deed (for example saying Ashrei three times a day)? How is it different from any other good deed that one does?




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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{...