Thursday, August 31, 2017

halacha - Are minor fasts obligatory?


Are "minor" fasts such as Taanit Esther ("Fast of Esther"; i.e. the day before Purim) or Tzom Gedaliyah ("Fast of Gedaliyah"; i.e. the day after Rosh Hashanah) optional or obligatory?


Under what conditions is one permitted to skip a minor fast?




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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{...