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Atomic Number: 88
Ra
Ra

Radium

226.0000 u

Category

alkaline earth metal

State at Room Temperature

solid

Electron Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²

Valence Electrons

2

Lewis Dot:••

Electronegativity

0.9

Pauling scale

Oxidation States

+2

Melting Point

973 K

699.85°C

Boiling Point

2010 K

1736.85°C

Density

5.5

g/cm³

Position in Table

Group 2Period 7s-block

Discovery

Historical Information

Discovered byMarie Curie, Pierre Curie
Year1898

Common Uses

Applications & Industries

Historical cancer treatment, luminous paints, radon source

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