Sunday, April 15, 2018

food - Drinking from a drinking fountain throughout the day



This question deals with someone who has a cup of a drink and carries it around all day long, possibly refilling it, etc. I am wondering, for someone who drinks from a drinking fountain every time he walks by it, should he make a new bracha each time he drinks? Does it matter how much time goes by between episodes? What other considerations are there?




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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{...