Sunday, November 11, 2018

halacha - Writing notes and highlighting in the Tanakh


Is taking notes and highlighting in a Hebrew/English Tanakh considered defacing the text?





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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{...