Tuesday, September 26, 2017

halacha - To what grains do the laws of yoshon apply?


For which species must we wait until after pesach to eat the previous crop? Are there different cut-off dates for different species?




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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{...