55 Cs Cesium 132,91 u

Cesium

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Chu kỳ
6
Nhóm
1
Khối
s-khối
Pha (STP)
Solid

Cesium is the most electropositive stable element. It is used in atomic clocks, which define the second in the SI system.

About Cesium

Cesium (Cs) is the most electropositive of the stable elements, giving up its single outer electron with exceptional ease. Element 55 heads group 1, period 6, in the s-block, with an atomic mass of 132.91, the electron configuration [Xe] 6s¹, and the lowest electronegativity of any stable element at 0.79. Its defining application is timekeeping: the vibrations of cesium-133 atoms define the SI second, the basis of atomic clocks worldwide. A soft, highly reactive alkali metal, cesium is solid at standard conditions and, like others in group 1, reacts vigorously with water.

Tính chất vật lý

Khối lượng nguyên tử 132.91 u
Pha ở STP Solid

Tính chất điện tử

Độ âm điện 0.79

Cấu hình electron

Cấu hình [Xe] 6s¹

Electron Shell Configuration

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

Position in Periodic Table

Cesium position in the periodic table Cs

Khối & Chu kỳ

Khối

s p d f

Chu kỳ

1 2 3 4 5 6 7

Bảng tuần hoàn

Lanthanide Actinide

Các phản ứng có Cs

Photoelectric Effect (Cesium)

Cs + hν → Cs⁺ + e⁻

Photochemical

Beta Decay of Cesium-137

¹³⁷Cs → ¹³⁷Ba + e⁻ + ν̄ₑ + γ

Nuclear

Thêm Kim Loại Kiềm

3 Li Lithium 11 Na Sodium 19 K Potassium 37 Rb Rubidium 87 Fr Francium

Frequently Asked Questions

What is Cesium?
Cesium (Cs) is a chemical element with atomic number 55. It is a solid at standard temperature and pressure, classified as a kim loại kiềm.
What are the key properties of Cesium?
Cesium has an atomic mass of 132.91 u.
What is the electron configuration of Cesium?
The electron configuration of Cesium is [Xe] 6s1. It is in the s-block of the periodic table.
What is the electronegativity of Cesium?
Cesium has an electronegativity of 0.79 on the Pauling scale.