CHEM Vocab

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Across
  1. 1. water freezing is an example of what chemists call a
  2. 3. is the force of attraction between two atoms that holds them together in a compound
  3. 5. the number of protons in the nucleus of each atom of a given element
  4. 11. how to show the number of atoms that arrange themselves in a unit of an element
  5. 13. chart of elements
  6. 14. total mass of an atom
  7. 15. name of the central core of the atom
  8. 18. Properties that describe the look or feel of a substance
  9. 19. gradual change across a period
Down
  1. 2. a representation of a system that helps predict how a system behaves
  2. 4. has same mass as protons but has no electric charge
  3. 6. combination of two or more substances in which each substance retains its properties
  4. 7. instrument used to observe the color components of any light source
  5. 8. Any change in a substance that involves a rearrangement of the way atoms are bonded
  6. 9. classification of any material consisting of only one type of atom
  7. 10. another name for cathode ray particle
  8. 12. the total number of protons plus neutrons in the nucleus
  9. 13. name for positively charged subatomic particles
  10. 16. variation of an element that has the same number of protons but a different number of neutrons
  11. 17. The total mass of an atom
  12. 20. when a mixture contains two or more elements or compounds