Elements
- 81
- WebElements: Calcium
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
- 82
- Wikipedia: Calcium
- Properties of the element, including its history, applications, and characteristics.
- 86
- Carbon and Life
- The properties of the many forms of carbon and their importance in life, fuels and emissions.
- 89
- WebElements: Carbon
- Extensive information on history, uses, occurrence, compounds, and properties of the element.
- 90
- Wikipedia: Carbon
- Properties of the element, including its history, applications, and characteristics.
- 94
- Wikipedia: Cerium
- Properties of the element, including its history, applications, and characteristics.
- 97
- USGS Minerals Information: Cesium
- Statistics and information on the worldwide supply, demand, and flow of the element (PDF format).
- 98
- WebElements: Caesium
- Extensive information on history, uses, occurrence, compounds, and properties.