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Friday, 05 July 2024

Favluv043

The atomic number of Caesium is 55 and its atomic mass is ____________

The atomic number of Caesium is 55 and its atomic mass is ____________

A. 78 protons and 55 electrons
B. 55 protons and 78 neutrons
C. 55 neutrons and 78 electrons
D. 78 neutrons and 55 neutrons




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