Periodic Table Crossword

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Across
  1. 5. a positively charged subatomic particle in the nucleus of an atom
  2. 7. any of the possible energies an electron may have in an atom
  3. 10. a region in an atom where there is a high probability of finding electrons
  4. 12. horizontal row of elements
  5. 13. any atoms having the same number of protons but a different number of neutrons
  6. 16. the number of protons in the nucleus
  7. 20. an element that has properties of both a metal and nonmetal
Down
  1. 1. a negatively charged subatomic particle found in the energy level of an atom
  2. 2. an electron in the outermost energy level of an atom
  3. 3. an ion with a positive charge
  4. 4. repeats at regular intervals
  5. 6. a neutral subatomic particle in the nucleus of an atom
  6. 8. the smallest particle that has the properties of an element
  7. 9. vertical column of elements
  8. 11. the process of adding electrons to or removing electrons from an atom or group of atoms
  9. 14. the center of an atom; made up of protons and neutrons
  10. 15. the elements that are good conductors of heat and electricity
  11. 17. an atom or a group of atoms that has lost or gained one or more electrons
  12. 18. the elemnts that are usually poor conductors of heat and electricity
  13. 19. the total number of protons and neutrons
  14. 21. an ion with a negative charge