Are the words ציפור (bird) and ציפורן (finger nail OR a spice [found in k'tores]) etymologically related? I heard that both were connected to the root צ.פ.ר (arise) or to anatomical protuberance but I don't understand either of these suggestions.
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{...
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