61 Pm Promethium 145.0 u

Promethium

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Period

Group

—

Block

f-block

Phase (STP)

Solid

Promethium is the only radioactive lanthanide with no stable isotopes. It is used in luminous paint and nuclear batteries.

Physical Properties

Atomic Mass 145.0 u

Phase at STP Solid

Electronic Properties

Electronegativity 1.13

Electron Configuration

Configuration [Xe] 4f⁵ 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 62 Sm Samarium 63 Eu Europium 64 Gd Gadolinium 65 Tb Terbium 66 Dy Dysprosium 67 Ho Holmium

Frequently Asked Questions

What is Promethium?

Promethium (Pm) is a chemical element with atomic number 61. It is a solid at standard temperature and pressure, classified as a lanthanide.

What are the key properties of Promethium?

Promethium has an atomic mass of 145.0 u.

What is the electron configuration of Promethium?

The electron configuration of Promethium is [Xe] 4f5 6s2. It is in the f-block of the periodic table.

What is the electronegativity of Promethium?

Promethium has an electronegativity of 1.13 on the Pauling scale.