Friday, November 16, 2018

minhag - reprinting of tanyas in many locations, why?


Why do Lubavitcher חסידים print “ספר של בינונים" in many different places — something about outward expansion of wellsprings?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, MgX2+ is closest in radius to LiX+. Is this true, and if so, why would a whole larger shell ($\ce{...