Friday, August 18, 2017

inorganic chemistry - Coordination number of carbon in methyllithium tetramer


According to J. D. Lee's Concise Inorganic Chemistry, the coordination number of carbon in $\ce{Li4(CH3)4}$ is $7$. But the structure of the tetramer is MethylLithiumTetramer


Doesn't carbon have coordination number $6$ here? Am I missing something?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

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{...