Thursday, February 9, 2017

history - When did the switch to matrilineal descent occur?


Does anyone know when the switch the matrilineal descent took place? I've seen other information about the potential impetus, but when did it become so? Was there even a switch?




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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{...