Radium (Ra), element 88 – Learn Acer periodic table

Alkaline earth metal, atomic number 88.

Radium is a chemical element with 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 almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).

Symbol Ra. Atomic mass 226.0 u. Group 2, period 7. Electron configuration [Rn] 7s2. Electrons per shell 2, 8, 18, 32, 18, 8, 2. State at room temperature: Solid. Melting point 959.9 °C, boiling point 1736.8 °C. Discovered by Pierre Curie.

Element data from Wikipedia, CC BY-SA 3.0.

Radium (Ra), element 88 – Learn Acer periodic table

Radium

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