Thorium

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Thorium

232.0381(1)
	Th
90
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶ 4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶6d²7s²

[ ? ]

Actinide:

Properties:

Soft, silvery-white, ductile metal.

Hazard:

Radioactive. Powdered thorium is pyrophoric.

Thorium is a chemical element, having the chemical symbol Th. Its atomic number (the number of protons) is 90. It has a standard atomic weight of 232.0381 g•mol⁻¹ and it is a solid in its elemental form.

Thorium is considered a member of the "Actinide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 4,788 °C and a melting point of 1,750 °C.