What is the difference between 勉強する, 習う, 学ぶ, and 学習する?
I've read some explanations in another questions but It's not clearly enough. Please help me to understand these. 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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