1.

The ` C-Si` single-bond distance is `SiC` (carbondum) or `(CH_(3))_(4)Si` is `194`pm and the convalent radius of `C` is `77`pm. Find the convalent radius of silicon. Strategy: Use Eq. to obtain directly the convalent radius of silicon.

Answer» `d_(C-Si) = r_(C) +r_(Si)`
or `r_(Si) = d_(C-Si) - r_(C)`
`= 194nm - 77`pm
`= 117` pm
Thus, the covalent radius of `Si` is `117`pm.


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