Thursday, November 2, 2017

halacha - Tweeting close to Shabbos


Is there any problem with tweeting at a time when it is Shabbos somewhere in the world? Jewish followers may reply or re tweet etc.




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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{...