Atoms and Periodic Table Crossword Puzzle

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Across
  1. 5. when an atom loses electrons
  2. 7. horizontal row of elements in the periodic table
  3. 8. when an atom gains electrons
  4. 10. subatomic particle with mass equivalent to a proton and no charge
  5. 12. particles smaller then the atom
  6. 13. subatomic particle with a negative charge located outside the nucleus
  7. 14. when the outermost energy level is not full and the atom is unstable
Down
  1. 1. vertical column of elements in the periodic table
  2. 2. electrons located on the outermost energy level that determines its stability
  3. 3. subatomic particle with a positive charge that is located in the nucleus
  4. 4. number of protons and electrons in the atom of that element
  5. 6. most dense part of the atom that holds protons and neutrons
  6. 9. when the outermost energy level is full and the atom is stable
  7. 11. total number of protons and neutrons in the nucleus of an atom
  8. 15. smallest unit of matter