1.9 understand that atoms consist of a central nucleus, composed of protons and neutrons, surrounded by electrons, orbiting in shells

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This is an atomic structure of helium. PC: BBC

  • Nucleus of an atom contains protons and neutrons
  • Electrons are found large distances from the atom, orbiting the nucleus on shells
  • Electrons have virtually no mass compared to the nucleus, therefore the mass of the atom is heavily concentrated in the nucleus 
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