Number of protons in Caesium is 55. This is approximately the sum of the number of protons and neutrons in the nucleus. How many electrons does cesium-137 have? Calculate the fraction of the volume occupied by the nucleus in a cesium atom. 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. Atomic weight of Caesium is 132.905452 u or g/mol. Isotopes The mass number of the stable form of cesium is 133. Round your answer to 1 (one) signiﬁcant ﬁgure. Caesium (IUPAC spelling) (also spelled cesium in American English) is a chemical element with the symbol Cs and atomic number 55. Relative atomic mass The mass of an atom relative to that of carbon-12. In atomic form (as opposed to being an ion), cesium-137 has 55 electrons, just as all cesium atoms have. Melting point of Caesium is 28,4 °C and its the boiling point is 690 °C. Density is the mass of a substance that would fill 1 cm 3 at room temperature. 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. 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. Here is a collection of cesium … Atomic Number of Caesium is 55.. Chemical symbol for Caesium is Cs. Where more than one isotope exists, the value given is the abundance weighted average. The compounds of cesium are similar to those of potassium. 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. This chemical element is distinctive for several reasons. Cesium. 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