Thursday, August 9, 2018

halacha - What is the the amount a person who feels weak on a fast day could eat or drink?


What is the the amount a person who feels weak on a fast day could eat or drink. How many ounces and how often?





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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{...