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Across
  1. 2. a particulate of matter that uniquely defines a chemical element
  2. 6. a subatomic particle with a charge of negative electricity
  3. 7. the approximate weight of an atom
  4. 10. synonym for unreactive
  5. 12. a group of elements held together by chemical bonds
  6. 15. an element that is not metal
  7. 16. the substance or substances of which any physical object consists
  8. 17. the number of protons in the nucleus of an atom
  9. 18. the outermost electron
  10. 20. the columns on the periodic table
Down
  1. 1. the impulse for which a chemical substance undergoes a chemical reaction
  2. 3. an element with properties inbetween metal and nonmetal
  3. 4. the system of electrons surrounding the nucleus of an atom
  4. 5. the rows on periodic table
  5. 6. a substance that cannot be broken down into simpler components by any non-nuclear chemical reaction
  6. 8. the physical property of matter that causes charged matter to experience a force when placed in an electromagnetic field
  7. 9. a subatomic particle without an electric charge
  8. 11. An equation that states
  9. 13. an element that has metal like characteristics
  10. 14. any of the gaseous element of group 8
  11. 16. an equation to find the neutron count of any given atom
  12. 19. the central core of an atom, consisting of protons and neutrons