Skip to content
- Name: Radium
- Symbol: Ra
- Atomic Number: 88
- Atomic Weight: 226 u
- Period: 7
- Group: 2 (beryllium group)
22 Radium Facts for Kids
- Radium is a chemical element on the periodic table.
- Radium is a radioactive metal that has a silvery white metallic color when in its pure form.
- Radium was first discovered on Wednesday, December 21st, 1898 by Polish physicist and chemist Marie Curie and her husband French physicist Pierre Curie.
- Radium was first isolated in 1910 by Polish physicist and chemist Marie Curie and French chemist André-Louis Debierne.
- The symbol for radium is Ra.
- The atomic number for radium is 88.
- The standard atomic weight of radium is 226 u.
- Radium is a solid at room temperature.
- Radium is in the alkaline earth metal element category on the periodic table.
- Radium is a period 7 chemical element, which is the seventh row on the periodic table.
- Radium is a group 2 chemical element, which is the beryllium group.
- Radium is the heaviest chemical element in group 2 (alkaline earth metals) of the periodic table.
- Radium is the only radioactive element in group 2 (alkaline earth metals) of the periodic table.
- Radium is in the s-block on the periodic table.
- The electron configuration for radium is [Rn] 7s2.
- The electrons per shell for radium is 2, 8, 18, 32, 18, 8, 2.
- Radium has no stable isotopes.
- The main isotopes of radium are 223Ra, 224Ra, 225Ra, 226Ra and228Ra.
- The melting point for radium is 1292 °F (700 °C).
- The boiling point for radium is 3159 °F (1737 °C).
- Radium can be obtained from uranium or thorium ore.
- Radium has no practical commercial applications outside of nuclear medicine.
Additional Resources on Radium
- Radium (Ra) – Discover more about the chemical element radium on the Los Alamos National Laboratory website.
- Radium for Kids – Find more information about the chemical element radium for kids on the Britannica Kids website.
- Radium and Your Health – Learn about the benefits and/or risks of radium to your health on the CDC website.
- Radium – PubChem – Read more about radium and the data behind it on the NIH PubChem website.