I am reading chapter 4 from the JLPT N5 book, where I found the following sentence:
昨日勉強しましたか。
After 昨日, why wasn't there a topic particle? Is "昨日は勉強しましたか。" an incorrect sentence?
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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