Oddball compound

Unusual transition element oxides

Transparent volatile liquids that are highly toxic:

• http://en.wikipedia.org/wiki/Osmium_tetroxide
• http://en.wikipedia.org/wiki/Ruthenium_tetroxide
• http://en.wikipedia.org/wiki/Rhenium(VII)_oxide

Rather inert compounds with fluorine

• Sulfur hexafluoride
• Nitrogen trifluoride

Other compounds with unusual properties

• Carbon disulfide

Compounds dominantly containing nitrogen

• http://en.wikipedia.org/wiki/Nitrous_oxide
• http://en.wikipedia.org/wiki/Ammonium_azide
• http://en.wikipedia.org/wiki/Tetrazene
• http://en.wikipedia.org/wiki/Ammonium_nitrate
• http://en.wikipedia.org/wiki/Ammonium_nitrite