atomic structure

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Across
  1. 3. Uncharged subatomic particle found in the nucleus
  2. 7. A particle with no overall electrical charge (number of protons = electrons)
  3. 8. Region where electrons orbit the nucleus at specific energy levels
  4. 9. The number of protons in an atom, specific to each element
  5. 10. A tiny, negatively charged particle found orbiting the nucleus in shells
Down
  1. 1. A positively charged subatomic particle found in the nucleus
  2. 2. The central part of an atom containing protons and neutrons
  3. 3. The electrical charge of an electron
  4. 4. The electrical charge of a neutron
  5. 5. The electrical charge of a proton
  6. 6. The sum of protons and neutrons in an atom