Where more than one isotope exists, the value given is the abundance weighted average. Round your answer to 1 (one) signiﬁcant ﬁgure. Melting point of Caesium is 28,4 °C and its the boiling point is 690 °C. This is approximately the sum of the number of protons and neutrons in the nucleus. Atomic Number of Caesium. How many electrons does cesium-137 have? In atomic form (as opposed to being an ion), cesium-137 has 55 electrons, just as all cesium atoms have. Caesium has physical and chemical properties similar to those of rubidium and potassium. This presents a particular hazard when radioactive cesium-137 contaminates the soil, as it did near Chernobyl.Growing plants require large amounts of potassium, and concentrate it from the soil. Isotopes Atomic weight of Caesium is 132.905452 u or g/mol. Caesium (IUPAC spelling) (also spelled cesium in American English) is a chemical element with the symbol Cs and atomic number 55. Calculate the fraction of the volume occupied by the nucleus in a cesium atom. Atomic Number of Caesium is 55.. Chemical symbol for Caesium is Cs. The mass of a cesium (Cs, atomic number 55) atom is 2.21×10−25 kg, and its radius is R = 2.65×10−10 m. The mass of the atomic nucleus roughly equals the mass of the whole atom. Relative atomic mass The mass of an atom relative to that of carbon-12. This chemical element is distinctive for several reasons. Density is the mass of a substance that would fill 1 cm 3 at room temperature. Cesium. Cesium or caesium is a metal with the element symbol Cs and atomic number 55. Number of protons in Caesium is 55. Mass Percent: Cesium: Cs: 132.90545: 1: 100.000% ... of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. Here is a collection of cesium … The mass number of the stable form of cesium is 133. It is a soft, silvery-golden alkali metal with a melting point of 28.5 °C (83.3 °F), which makes it one of only five elemental metals that are liquid at or near room temperature. The nuclear density is 2×1017 kg/m3. The compounds of cesium are similar to those of potassium. If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight.