Summary:
- Group 2 elements are referred to as “alkaline earth’ metals (tan column below) Calcium compounds are widely found in limestone, marble, and chalk.
- Barium compounds can be used in paints, filler for rubber, plastic, and resins.
- Magnesium alloys with aluminum provide light weight and sturdy materials for airplanes, missiles, and rockets.
- Radium is a radioactive element and is generally under the category of radioisotopes in addition to being an alkaline earth metal, because it is not a stable element.