Chemistry crossword

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Across
  1. 4. negatively charged particle
  2. 6. smallest component of an element
  3. 7. elctron located outermost shell of atom (2 words)
  4. 10. a wave describing state of single electron in atom
  5. 12. mass of an element (2)
  6. 13. a substance obtained from another substance through chemical Change
  7. 14. columns on the pt of elements
  8. 15. group on pt including all alkali metal, alkaline earth metals and others
  9. 16. substance composed of two or more elements whose constant
  10. 18. chemical change with heat going in
  11. 19. particle with no charge
  12. 22. was a Russian chemist (2 words)
  13. 25. 1 or 2 letters referred to elements
Down
  1. 1. chemical change with heat going out
  2. 2. positively charged particle
  3. 3. includes helium, neon,argon, krypton, xenun, radon
  4. 5. law saying that mass in isolated system is neither created or destroyed by chemical change
  5. 8. horizontal row of elements on pt
  6. 9. group including boron, silicon, germanium, arsenic, antimony, tellurium
  7. 11. number of electrons or protons (2)
  8. 17. coating or layer of material esp mass
  9. 18. one class substances that can't be separated simpler
  10. 20. central part of atom
  11. 21. any substance that undergoes chemistry change in given reaction
  12. 23. smallest physic, unit of an element of compound w/ one or more atoms
  13. 24. includes carbon, nitrogen, oxygen, phosphorus, sulfur, and selenium