According to which Mitzva Boaz made a Yibum (Levirate marriage) for Ruth?
As I know, Yibum Mitzva is for brothers only (see Rambam Yibum 1,1), while Boaz was a far kinsman Ruth.
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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