Periodic table Crossword Puzzle

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Across
  1. 3. measure of an atom's ability to attract shared electrons to itself.
  2. 5. any of the six nonmetallic elements that constitute Group 17
  3. 8. the property of matter where it has more or fewer electrons than protons in its atoms
  4. 11. the outside part of an atom around the atomic nucleus.
  5. 12. patterns in elements on the periodic table
  6. 14. a substance that contains only one type of atom.
  7. 16. smallest part of a substance that cannot be broken down chemically
  8. 17. soft, silvery-white, metal part of the periodic table of the elements
  9. 18. colourless, odourless, tasteless, gaseous substance is the simplest member of chemical elements.
  10. 20. The temperature at which a substance undergoes a solid to liquid phase change
  11. 21. chemical element with symbol C and atomic number 6
Down
  1. 1. any of a group of rare gases that include helium, neon, argon, krypton, xenon.
  2. 2. the total distance from the nucleus of an atom to the outermost orbital of its electron.
  3. 4. chemical element with symbol Ca and atomic number 20.
  4. 6. nonmetallic element of Group 15 of the periodic table.
  5. 7. mass of a unit volume of a material substance
  6. 9. the electrons in the outermost shell, or energy level, of an atom
  7. 10. elements on the right of the periodic table, can be gases, liquids or solids.
  8. 13. the release of energy from the decay of the nuclei
  9. 15. stable subatomic particle with a charge of negative electricity.
  10. 19. Charge the total charge in the nucleus of all the protons