Friday, September 7, 2018

sources mekorot - what are the origins of the requirement for a minyan?


From what is the requirement for ten adult Jewish males for certain prayers derived?


I kind of assumed this may be in some way related to Abraham's struggle to find the righteous males in the cities of Sodom and Gomorrah but I could be wrong.




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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{...