chemistry crossword

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Across
  1. 2. mass unit measure of atomic mass
  2. 4. vertical column of elements in the periodic table
  3. 5. reaction a reaction that takes place when two or more substances react to form new substances
  4. 8. element that has both metallic and nonmetallic properties
  5. 9. metals group 1 elements in the periodic table ,not including hydrogen
  6. 10. cloudy mixture in which tiny particles of one substance are held within another
  7. 12. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
  8. 13. change change in appearance or state of a substance that does not change the composition
  9. 15. shells orbit of electrons around the nucleus of an atom
  10. 16. positively charged particle in the nucleus of an atom
  11. 17. vertical of elements in the periodic table
Down
  1. 1. horizontal row of elements in the periodic table
  2. 3. chemical combination of two or more elements in a specific ratio
  3. 6. metals group 2 elements in the elements periodic table
  4. 7. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from out from the other substance
  5. 11. slow chemical change that occurs when oxygen in the air reacts with a metal
  6. 14. neutral particle in the nucleus of an atom