I have noticed that many families (including my own) have the custom for the father to bless all the children on Friday night before kiddush.
When and where did this custom originate, and by whom, and why is it done before Kiddush on Friday night?
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{...
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