Thulium

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Thulium

168.93421(2)
	Tm
69
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶ 4d¹⁰5s²5p⁶4f¹³6s²

[ ? ]

Lanthanide:

Properties:

Silver-gray, soft, malleable and ductile metal.

Thulium is a chemical element, having the chemical symbol Tm. Its atomic number (the number of protons) is 69. It has a standard atomic weight of 168.9342 g•mol⁻¹ and is a solid in its elemental form.

Thulium is considered a member of the "Lanthanide" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 1,950°C and a melting point of 1,545 °C.