The isotope deuterium of hydrogen has
  • No neutrons and one proton
  • One neutrons and two protons
  • One electron and two neutron
  • One proton and one neutron
The atomic number of sodium is 11 and its mass number is 23. It has
  • 11 neutrons and 12 protons
  • 12 protons and 11 electrons
  • 11 electrons and 12 neutrons
  • 12 electrons and 11 neutrons
0 h : 0 m : 1 s

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