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

Chemistry
JAMB 1989
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
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Correct Answer: Option B
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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