Marie and Pierre Curie Discover Radium

About this moment

Radium is a chemical element; it has symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) upon exposure to air, forming a black surface layer of radium nitride (Ra3N2).

People

• Marie Curie · 1867 CE – 1934 CE
• Pierre Curie · 1859 CE – 1906 CE

Source

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