## Monday, April 1, 2013

### KnowledgeDoor

Find facts about the chemical elements at the KnowledgeDoor website--atomic weight, oxidation, ionization, density, melting point, boiling point, atomic radius, orbital radius, speed of sound, Curie point, Neel point, abundance in the human body, CAS number, DOT number, ICSC number, RTECS number, and many more. Each fact is referenced with one or more citations.