What Poskim rule that the Internet is totally ok to use (without a filter)? What Poskim rule that's it's never ok to use? What Poskim say that you can use it, but with a filter?
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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