The atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?

The atomic number of cesium (cs) is 55. if an atom of cesium has 78 neutrons, what is the atomic mass of cesium?

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  1. The atomic number of cesium = 55

    So number of electron in cesium = 55

    While number of protons in cesium = 55

    Atomic mass of cesium= number of protons + number of neutrons  

    Number of neutrons in cesium is given as 78

    Atomic mass of cesium= number of protons + number of neutrons  

    Atomic mass of cesium=55 + 78

                                           = 133

    So, atomic weight of cesium is 133

  2. Name: Cesium
    Symbol: Cs
    Atomic Number: 55
    Atomic Mass: 132.90546 amu
    Melting Point: 28.5 °C (301.65 K, 83.3 °F)
    Boiling Point: 678.4 °C (951.55005 K, 1253.12 °F)
    Number of Protons/Electrons: 55
    Number of Neutrons: 78
    Classification: Alkali Metal
    Crystal Structure: Cubic
    Density @ 293 K: 1.873 g/cm3
    Color: silver
    British Spelling: Caesium
    IUPAC Spelling: Caesium

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