57 La Lanthanum 138.91 u

Lanthanum

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周期
6
族
—
区块
f-区块
相态 (STP)
Solid

Lanthanum is the first element in the lanthanide series. It is used in camera lenses, catalysts, and battery electrodes.

About Lanthanum

The first element of the lanthanide series, lanthanum (La) gives the entire family of rare earths its name, from the Greek for to lie hidden. Element 57 falls in period 6 of the f-block, with an atomic mass of 138.91, the electron configuration [Xe] 5d¹ 6s², and a low Pauling electronegativity of 1.1. A soft, silvery, reactive metal, it is used in high-refractive-index optical glass for camera and telescope lenses, as a catalyst in petroleum refining, and in the electrodes of nickel-metal-hydride batteries. Lanthanum is solid at standard conditions and typically adopts the +3 state shared across the series.

物理属性

原子质量 138.91 u
STP相态 Solid

电子属性

电负性 1.1

电子构型

构型 [Xe] 5d¹ 6s²

Electron Shell Configuration

Lanthanum electron shell configuration La 2e⁻ 8e⁻ 18e⁻ 18e⁻ 9e⁻ 2e⁻
Electron shell structure of Lanthanum — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 18
5 (O) 9
6 (P) 2

Position in Periodic Table

Lanthanum position in the periodic table La

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

Compounds Containing Lanthanum

Lanthanum Oxide

La₂O₃

更多镧系元素

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 67 Ho Holmium

Frequently Asked Questions

What is Lanthanum?
Lanthanum (La) is a chemical element with atomic number 57. It is a solid at standard temperature and pressure, classified as a 镧系元素.
What are the key properties of Lanthanum?
Lanthanum has an atomic mass of 138.91 u.
What is the electron configuration of Lanthanum?
The electron configuration of Lanthanum is [Xe] 5d1 6s2. It is in the f-block of the periodic table.
What is the electronegativity of Lanthanum?
Lanthanum has an electronegativity of 1.1 on the Pauling scale.