Caesium (Cs) - 55 on the Periodic Table | Periodic Table

Standard IUPAC: Caesium • Symbol: Cs • Atomic Mass: 132.90545196 u

Quick Factsheet: Caesium (symbol Cs, atomic number 55) is element 55 on the periodic table of elements. It has a standard atomic weight of 132.90545196 u and an electron configuration of [Xe] 6s1. On the periodic table, Caesium is classified in period 6 and group Main.

1. Periodic Table Position of Caesium (55 on the Periodic Table)

Element Caesium has atomic number Z = 55, meaning it contains 55 protons in its atomic nucleus and 55 electrons in its neutral state. On the standard periodic table of elements, Caesium is located in period 6 and group Main.

2. Electron Configuration & Oxidation States (Caesium Charges & Configuration)

Full Electron Configuration: [Xe] 6s1

Common Oxidation States (Charges): -1,1c

3. Physical Properties & Atomic Mass (Caesium Atomic Mass)

Element Caesium has a standard atomic weight of 132.90545196 u. Its melting point is 301.59 K and boiling point is 944. K. The Pauling electronegativity value is 0.79.

Comprehensive chemical properties and data for Caesium (Cs, Z=55).

Explore interactive 3D electron orbitals, isotopes, and properties on the periodic table: Open on Interactive Table 🚀

4. Related Elements in the Same Chemical Family

Li (Z=3) Na (Z=11) K (Z=19) Rb (Z=37) Fr (Z=87)

5. Frequently Asked Questions about Caesium (FAQ)

What is the chemical symbol and atomic number of Caesium?

The chemical symbol of Caesium is Cs and its atomic number is 55.

What is the atomic mass and electron configuration of Caesium?

Caesium has a standard atomic mass of 132.90545196 u and ground-state electron configuration of [Xe] 6s1.

What periodic table group and period does Caesium belong to?

Caesium is located in period 6 and group Main on the periodic table of elements.

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