Apart from hydrogen which forms a duet, which element's don't observe the octet rule?
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$\begingroup$ I plugged your question into google and this is what I got as the first link. Do you need something more than this description? $\endgroup$– bobthechemistCommented Jun 30, 2013 at 2:36
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$\begingroup$ I was hoping for a list rather than long descriptions.. $\endgroup$– jaykirbyCommented Jun 30, 2013 at 2:56
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$\begingroup$ see also ChemWiki:Violations of the Octet Rule $\endgroup$– SparklerCommented Mar 7, 2015 at 15:19
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Octet rule is more advisory than a rule; It's usually obeyed by the main group elements. Exception are paramagnetic compounds (obvious reason); first for elements in periodic system (He-configuration), 3-valent boron compounds; depending on counting system boron clusters (f.e. dodecaborane with 6-coordianted boron); transition metal complexes (these usually follow 18e rule, however there are plenty of examples with 14, 16 or even 20 electron complexes).
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$\begingroup$ It would be nice if you give some examples for TM-complexes not obeying 18e rule. $\endgroup$– tatus2Commented Jun 30, 2013 at 8:18
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$\begingroup$ Enough that you look at the metallocenes. 15e: VCp2 (Cp=C5H5-); 16e: CrCp2; 17e: MnCp'2 (Cp'=C5H4Me-); 19e: CoCp2; 20e: NiCp2. Most of them are commercial products. $\endgroup$– Kris_RCommented Jun 30, 2013 at 15:00