Chemistry Chapter 16 Properties of Atoms/Periodic Table Crossword Puzzle

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Across
  1. 2. center, weighted part of an atom
  2. 4. most isotopes have this characteristic
  3. 6. abbreviation for atomic mass unit
  4. 8. vertical categories of elements on periodic table
  5. 10. determined that electrons travel in fixed orbits around nucleus
  6. 12. person who developed the periodic table
  7. 14. when an isotope decays into another isotope
  8. 15. smallest particle of an element
  9. 17. Greek that gave atoms their name
  10. 19. the atomic number tells the number of ____ in atom
  11. 22. the smallest particles that make up protons and neutrons
  12. 23. another name for groups on the P.T.
  13. 24. neutrally charged atomic particle
  14. 25. some element names/symbols are based on this language name
  15. 26. horizontal categories of elements on periodic table
Down
  1. 1. process that combines hydrogen and helium to make energy
  2. 3. explosion of a star/sun
  3. 5. discovered that atoms have a nucleus
  4. 7. if atomic mass is .4 or below, you round it _____
  5. 9. word that means repeated in a pattern
  6. 11. another name for rows on the P.T.
  7. 13. Greek word that means indivisible
  8. 15. The Large Hadron Collider is a particle ____
  9. 16. atoms of same element that have different number of neutrons
  10. 18. negatively charged atomic particle
  11. 20. part of atom with most all of its mass
  12. 21. positively charged atomic particle