Periodic Table Crossword

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Across
  1. 1. elements that have properties of both a metal and a non-metal
  2. 3. a vertical column of elements in the periodic table
  3. 7. a region in an atom where there is a high probability of finding electrons
  4. 8. an ion with a positive charge
  5. 12. the process of adding electrons to or removing electrons from an atom or group of atoms
  6. 14. positive charge; located inside the nucleus
  7. 15. elements that are good conduct of heat and electricity
  8. 16. any of the possible energies an electron may have in an atom
  9. 17. neutral charge; located inside the nucleus
  10. 19. group 1 or 1A
  11. 20. a negative charged subatomic particle found in the energy level of an atom
  12. 21. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
Down
  1. 2. the smallest particle that has the properties of an element
  2. 4. a horizontal row of elements in the periodic table
  3. 5. elements that are poor conductors of heat and electricity
  4. 6. the number of protons in the nucleus of an atom
  5. 9. the total number of protons and neutrons in the nucleus of an atom
  6. 10. any atoms with the same number of protons but different number of neutrons
  7. 11. an ion with a negative charge
  8. 13. an electron in the outermost energy level of an atom
  9. 14. the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  10. 18. the center of an atom; made up of protons and neutrons