61 Pm Promethium 145.0 u

Promethium

周期
6
族
—
区块
f-区块
相态 (STP)
Solid

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

About Promethium

Alone among the lanthanides, promethium (Pm) has no stable isotopes and is intensely radioactive, making it exceedingly rare in nature. Element 61 sits in period 6 of the f-block, with an atomic mass near 145, the electron configuration [Xe] 4f⁵ 6s², and a Pauling electronegativity of 1.13. Its radioactivity is put to practical use: promethium has been incorporated into self-luminous paints and into compact nuclear batteries that supply long-lived power for specialized instruments. The element is a soft metal, solid at standard conditions, and adopts the +3 oxidation state of its neighbors.

物理属性

原子质量 145.0 u
STP相态 Solid

电子属性

电负性 1.13

电子构型

构型 [Xe] 4f⁵ 6s²

Electron Shell Configuration

Promethium electron shell configuration Pm 2e⁻ 8e⁻ 18e⁻ 23e⁻ 8e⁻ 2e⁻
Electron shell structure of Promethium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 23
5 (O) 8
6 (P) 2

Position in Periodic Table

Promethium position in the periodic table Pm

区块与周期

区块

s p d f

周期

1 2 3 4 5 6 7

元素周期表

镧系元素 锕系元素

更多镧系元素

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 镧系元素.
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.