chemistry unit crossword

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Across
  1. 3. Atomic particles found in the nucleus of an atom and carry a positive charge
  2. 7. a group of atoms bonded together
  3. 8. properties characteristic of no more than two electrons
  4. 9. Atomic particles that move around the nucleus of an atom and carry a negative charge
  5. 10. of Conservation of Mass mass in an isolated system is neither created or destroyed by chemical reaction or physical transformation.
  6. 12. the number of protons in the nucleus of an atom
  7. 14. He formulated the Periodic Law
  8. 15. brittle,not malleable or ductile,poor conductors of heat and electricity
  9. 17. (on the P.T.) the horizontal lines on the periodic table
  10. 19. Gas any of the most gaseous elements like helium,neon,krypton
  11. 20. the central and most important part of an object
Down
  1. 1. are the ingredients produced AFTER the reaction takes place
  2. 2. is a substance formed when two or more chemical elements are chemically bonded together.
  3. 4. (on the P.T.) columns on the periodic table
  4. 5. that is associated with an atom
  5. 6. Atomic particles found in the nucleus of atoms and carry NO electrical charge
  6. 11. an extremely small amount of a thing or quality
  7. 12. the mass of an atom of a chemical element expressed in atomic mass units
  8. 13. Shares characteristics of both nonmetals and metals
  9. 16. atoms having the same number of protons
  10. 18. solid,shiny, good conductors of heat and electricity, ductile, and malleable
  11. 21. abbreviation or the element