In the universe, neutrons are abundant, making up more than half of all visible matter. 133Cs is the most common isotope, having a natural abundance of approximately 100%.Ĭaesium-133 is composed of 55 protons, 78 neutrons, and 55 electrons.Ĭaesium-135 is composed of 55 protons, 80 neutrons, and 55 electrons.Ī neutron is one of the subatomic particles that make up matter. 135Cs is very slightly radioactive, decaying by beta decay with a half-life of 2.3×10 6 years and occurs only in traces. Main Isotopes of CaesiumĬaesium occurs in 2 natural isotopes: 133Cs and 135Cs. Mass numbers of typical isotopes of Caesium are 78. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z.įor stable elements, there is usually a variety of stable isotopes. Neutron number plus atomic number equals atomic mass number: N+Z=A. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N.
The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19 coulombs. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. Caesium is a chemical element with atomic number 55 which means there are 55 protons in its nucleus.
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