Answers (1) Sebella 7 August, 05:52. The atomic number of cesium (Cs) is 55.The atomic weight of Cs is 132.91 grams per mole.See the Web Links to the left of this answer for a periodic table with more information about this element! Uses of Cesium. The Element Cesium Atomic Number: 55 Atomic Mass: 132.91 Melting Point: 301.59 K (28.44°C or 83.19°F) Boiling Point: 944 K (671°C or spideylover10 spideylover10 Answer: 133. The name is derived from a Latin word Caesius which means sky blue, as it burns with a blue flame. It is a soft, silvery-gold alkali metal with a melting point of 28 °C (82 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. This name has been derived from a Latin word Caesius which means sky blue, as it ignites with blue fire. CAS number Relative atomic mass The mass of an atom relative to that of carbon-12. If an atom of cesium has 78 neutrons, what is the atomic mass of cesium? Caesium or cesium is a chemical element with symbol Cs and atomic number 55. Where more than one isotope exists, the value given is the abundance weighted average. 0. the atomic number of cesium (Cs) is 55. Isotopes Atoms of the same element with different numbers of neutrons. View cesium.docx from CHE 121 at Clinton High, Clinton. This is approximately the sum of the number of protons and neutrons in the nucleus. Cesium is a chemical element with symbol Cs and atomic number 55. Explanation: New questions in Physics. Cesium (Cs) is a compound element with atomic number 55 in the periodic table found by Gustov Kirchhoff and Robert Bunsen in the year 1860. If an atom of cesium has 78 neutrons, what is the atomic mass of cesium? Cesium (Cs) is a chemical element in the periodic table with atomic number 55 discovered by Fustov Kirchhoff and Robert Bunsen in the year 1860. 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