Thursday, May 25, 2017

shabbat - Number of Candles at Lighting


How many candles should one light on Erev Shabbos and Yom Tov? And why that number?




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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{...