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The atomic number of caesium is 55 and its atomic mass is 133. The nucleus…

The atomic number of caesium is 55 and its atomic mass is 133. The nucleus of caesium atom therefore contains
  • A.
    78 protons and 55 elections
  • B.
    55 protons and 78 neutrons
  • C.
    55 neutrons 78 electrons
  • D.
    78 protons and 55 neutrons
Correct Answer: Option B
Explanation

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