In various shuls I have attended, if the chazan sings kaddish (like the chatzi-kaddish before Ma'ariv Amida on Yom Tov nights) many people in the shul sing along with the kaddish. Is this permitted?
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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