Friday, May 5, 2017

tefilla - Two Yahrtzeits One for Mother one for Father who comes First


All other things being equal Halachically, if you have two people with Yahrtzeits one for a mother and one for a father, who has priority with regards to getting an Aliyah (and/or davening for the amud and/or saying kadish), and why?




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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{...