Periodic Table Challenge: Crossword Puzzle

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Across
  1. 1. We are positively charged particles.
  2. 5. We are the glue that holds the atom together.
  3. 8. I am a good conductor of heat and electricity.
  4. 9. I am the number of protons in an element’s nucleus.
  5. 11. We are the electrons in the outer most energy level of an atom.
  6. 13. I am an atom that in which there is an unequal number of protons and electrons.
  7. 14. I am an atom that has more electrons than protons.
  8. 17. I have properties of both metals and non-metals.
  9. 18. I am usually poor at conducting heat and electricity.
Down
  1. 1. I am the chart that organizes the elements of the universe.
  2. 2. I am the special unit used for the mass of a subatomic particle.
  3. 3. We are negatively charged particles.
  4. 4. I am an atom that has more protons than electrons.
  5. 6. I am the total number of protons and neutrons in the nucleus of an atom.
  6. 7. I am a vertical column in the periodic table.
  7. 10. I am a horizontal column in the periodic table.
  8. 12. I am any possible energies and electrons in an atom.
  9. 15. I am a substance that cannot be broken down into smaller pieces.
  10. 16. I am the “smallest piece of matter” and if I am broke down I will lose my original properties.
  11. 18. I am the center of an atom.