Tuesday, September 19, 2017

halacha - Newspaper delivery on Yom Tov


Is getting a Paper delivered on Yom Tov allowed? If not what may be done with it upon Delivery? as always (CYLOR)




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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{...