Chemicool
Chemicool.com: Silicon
This site from Chemicool.com provides a very through set of tables summarizing many physical and chemical properties of silicon.
Science Struck
Science Struck: Can Diamonds Be Melted or Dissolved?
While diamonds are extremely hard and strong, they are not indestructible. Learn how diamonds can be burned, melted, or dissolved.
Curated OER
[Bohr Model of Radon]
Excellent summary of physical and chemical properties of radon, along with electron arrangement information and isotope data.