Caesium (IUPAC spelling; [9] also spelled cesium in American English) is a chemical element; it has symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F; 301.6 K), which makes it one of only five elemental metals that are liquid at or near room temperature .

Caesium is a soft, gold-coloured metal that is quickly attacked by air and reacts explosively in water. The most common use for caesium compounds is as a drilling fluid. They are also used to make special optical glass, as a catalyst promoter, in vacuum tubes and in …

Mar 13, 2025 · cesium (Cs), chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered spectroscopically (1860), by German scientists Robert Bunsen and Gustav Kirchhoff, who named it for the unique blue lines of its spectrum (Latin caesius, “sky-blue”).

Cesium is the 55th element in the periodic table and has a symbol of Cs and atomic number of 55. It has an atomic weight of 132.90545 and a mass number of 133. Cesium has fifty-five protons and seventy-eight neutrons in its nucleus, and fifty-five electrons in six shells.

Periodic Table element Summary Cesium. Cesium is a chemical element with symbol Cs and atomic number 55. Classified as an alkali metal, Cesium is a solid at room temperature.

Caesium is one of four elements who exist in liquid form at or near room temperature. In periodic table it belongs to alkaline elements. Its physical properties are similar with rubidium and potassium. In the presence of mineral oil it loses its metallic luster. It has the melting point of 28.5 o C and also has a low boiling point 641 o C.

Cesium is a chemical element of the periodic table with chemical symbol Cs and atomic number 55 with an atomic weight of 132.905 u and is classed as alkali metal and is part of group 1 (alkali metal). Cesium is solid at room temperature.

Get the facts about element Caesium (Cs) [55] from the periodic table. Find physical data, electron configuration, chemical properties, aggregation states, isotope data (including decay trees) as well as some historic information.

Sep 1, 2024 · Cesium element (also spelled as caesium) is in group 1 and period 6 of the Periodic table. Cesium is the s-block element and it belongs to alkali metals group. Click on above elements (in Periodic table) to see their information. Why is Caesium in Group 1?

Caesium is a soft, silvery-gold alkali metal with a melting point of 28.5 °C, which makes it one of only five elemental metals that are liquid at or near room temperature. Caesium has physical and chemical properties similar to those of rubidium and potassium.