Monday, June 18, 2018

yeshiva school - Does an Orthodox rabbi have to have semicha?


I have heard that in the Orthodox world rabbis that teach are referred to as "Rabbi" even though they might not have semicha. Even several roshei yeshivah might not have semicha. can this be true?




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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{...