Crossword

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Across
  1. 2. Gold is an example of an ____________
  2. 5. rays and particles emitted by the radioactive material
  3. 7. lowest energy state of an atom
  4. 9. elements in group 7A which are highly reactive
  5. 12. the number of protons in an atoms is the __________
  6. 13. has both physical and chemical properties of metals and nonmetals
  7. 15. nonreactive group 8A
  8. 16. minimum amount of energy that can be gained or lost by an atom
  9. 17. NaCl is an example of a ____________
  10. 19. homogeneous also referred as
Down
  1. 1. all moving particles have wave characteristics
  2. 3. combination of two or more pure substances
  3. 4. has a constant composition
  4. 6. usually gases or brittle, poor conductor of heat
  5. 8. has its own definite shape and volume
  6. 10. the smallest particle of an element that retains the properties of an element is ____________
  7. 11. number of waves that pass a given point per second
  8. 13. elements that are shiny, solid at room temperature, malleable
  9. 14. negatively charged particles surrounding the nucleus
  10. 18. same number of protons but different number of neutrons