69 Tm Thulium 168.93 u

Thulium

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Period

Group

—

Block

f-block

Phase (STP)

Solid

Thulium is the least abundant lanthanide in Earth's crust. It is used in portable X-ray devices and solid-state lasers.

Physical Properties

Atomic Mass 168.93 u

Phase at STP Solid

Electronic Properties

Electronegativity 1.25

Electron Configuration

Configuration [Xe] 4f¹³ 6s²

Electron Shell Configuration

Position in Periodic Table

Block & Period

Block

s p d f

Period

1 2 3 4 5 6 7

Periodic Table

Lanthanides Actinides

More Lanthanide

57 La Lanthanum 58 Ce Cerium 59 Pr Praseodymium 60 Nd Neodymium 61 Pm Promethium 62 Sm Samarium 63 Eu Europium 64 Gd Gadolinium 65 Tb Terbium 66 Dy Dysprosium

Frequently Asked Questions

What is Thulium?

Thulium (Tm) is a chemical element with atomic number 69. It is a solid at standard temperature and pressure, classified as a lanthanide.

What are the key properties of Thulium?

Thulium has an atomic mass of 168.93 u.

What is the electron configuration of Thulium?

The electron configuration of Thulium is [Xe] 4f13 6s2. It is in the f-block of the periodic table.

What is the electronegativity of Thulium?

Thulium has an electronegativity of 1.25 on the Pauling scale.