Saturday, September 8, 2018

internet - If three men pre-arranged to sit down and eat together over a video-chat, is there any reason they shouldn't have a zimun?


I learned that if two groups were eating in two different rooms but even one person could see someone in the other room, then they could have one zimun (I thought this was in Masechet Brachot, but I can't find it). Could this extend to video-chat?




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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{...