- A brilliant white metallic radioactive chemical element whose atomic number is 88. It has over 30 identified isotopes, all of which are radioactive. Radium emits alpha, beta, and gamma radiation, and neutrons when mixed with beryllium. It is used as a neutron and gamma ray source, in luminous paints, and in the treatment of diseases, such as cancer. Its chemical symbol is Ra.
- chemical symbol Ra
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