Wednesday, July 5, 2017

disposal - After the Seder, can you give the shank bone to the dog?


Serious question. In general, what are the laws or customs regarding the treatment of the items on the Seder plate? Are they to be considered commonplace or holy? Does it differ before and following their usage at the Seder? Should one differentiate between the items which we bless and consume, and those we don't?




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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{...