Chemistry Crossword Challenge

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Across
  1. 3. the time that it takes for half the atoms in a given sample to decay
  2. 7. 6.02 x 10^23
  3. 8. the basic unit of matter
  4. 9. a large nucleus splits into two smaller nuclei
  5. 12. element with only one proton in the nucleus
  6. 15. water is a ________ molecule
  7. 18. small number used to state the ratio of elements in a chemical formula
  8. 19. a nuclear emission containing two protons and two neutrons
  9. 20. a nuclear emission with no mass and a negative charge
  10. 21. the highest energy electron shell
  11. 23. a negative subatomic particle discovered by Thomson
  12. 24. horizontal arrangement of elements in the periodic table
  13. 26. Mrs. Torres' favorite compound
  14. 27. Ar
  15. 28. from gas to liquid
Down
  1. 1. two or more elements chemically combined
  2. 2. symbol for iron
  3. 4. combines two light nuclei to form a heavier nucleus
  4. 5. element number 79
  5. 6. neutral particle inside the nucleus of an atom
  6. 10. contains protons and neutrons
  7. 11. vertical columns on the periodic table
  8. 13. substance shown before the arrow in a chemical equation
  9. 14. nuclear emission with the greatest penetration power
  10. 16. letters that represent an element in the Periodic Table
  11. 17. from liquid to solid
  12. 22. it goes up as the temperature goes up
  13. 24. positive particle inside the nucleus of an atom
  14. 25. substance shown after the arrow in a chemical equation
  15. 29. symbol for silver