55 Cs 세슘 132.91 u

세슘

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주기
6
1
블록
s-블록
상 (표준 상태)
Solid

세슘은 안정한 원소 가운데 전기양성도가 가장 크다. SI 단위계에서 초를 정의하는 원자시계에 쓰인다.

세슘 개요

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.

물리적 성질

원자 질량 132.91 u
표준 상태에서의 상 Solid

전자적 성질

전기 음성도 0.79

전자 배치

배치 [Xe] 6s¹

전자껍질 배치

세슘의 전자껍질 배치 Cs 2e⁻ 8e⁻ 18e⁻ 18e⁻ 8e⁻ 1e⁻
세슘의 전자껍질 구조 — 껍질별 전자 수.
껍질 전자
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 18
5 (O) 8
6 (P) 1

주기율표에서의 위치

주기율표에서 세슘의 위치 Cs

Frequently Asked Questions

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