What is the structure and color of $\ce{CrO3}$?
Also, is it possible to produce $\ce{CrO3}$ when dichromate is heated with sulphuric acid?
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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