The Periodic Table of Elements by Lucy Pankow

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Across
  1. 4. a substance that cannot be separated or broken down into simpler substances by chemical means
  2. 5. a substance made up of atoms of two or more different elements joined by chemical bonds
  3. 8. a vertical column of elements in the periodic table
  4. 9. an element that conducts heat and electricity poorly
  5. 12. type of metal that is easily combined
  6. 14. bond between a metal and a nonmetal
  7. 15. a unit of mass that describes the mass of an atom or a molecule
  8. 16. an element that is shiny and that conducts heat and electricity well
  9. 18. a subatomic particle that has a positive charge and that is found in the nucleus of an atom
  10. 20. bond between a nonmetal and a nonmetal
Down
  1. 1. name for the most important elements
  2. 2. a subatomic particle that has a negative charge
  3. 3. a horizontal row of elements in the periodic table
  4. 6. bond between a metal and a metal
  5. 7. a subatomic particle that has no charge and is found in the nucleus of an atom
  6. 10. element that have have properties of both metals and nonmetals
  7. 11. number of protons and neutrons in an atom
  8. 12. the mass of an atom expressed in atomic mass units
  9. 13. an atom that has the same number of protons as other atom of the same element do but that has a different number of neutrons
  10. 17. makes up the universe
  11. 19. in physical science an atoms central region which is made up of protons and neutrons