I know that one of them is なくてはいけません and the other one なければなりません, I just don't know which is which, also a few example sentences would help a lot, thank you.
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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