おばあさん は 川(かわ) へ せんたく に でかけます。
Why is there both へ and に? When can they be used together? Can someone break down the sentence for me to understand?
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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