Avraham leaves Hashem to deal with guests in Vayera - because welcoming guests is greater than Kabolas Pnei HaSh'china.
Does that mean we can interrupt our Shmoneh Esrei to do mitzvahs? At least to do hachnosas orchim?
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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