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18 November, 05:57

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. 18 November, 07:29
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    133 is the answer, because the atomic number is the number of protons in an atom, and the mass is the number of protons plus the number of neutrons. and 55+78 is 133.
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