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The atomic number of an element is 55 and its atomic mass is 133. the nucleus of the ...

The atomic number of an element is 55 and its atomic mass is 133. the nucleus of the atom therefore contains

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





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