Matter FC

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Across
  1. 2. ______ number, the horizontal rows
  2. 5. atoms having the same proton but differ in the no. of neutrons
  3. 6. has a symbol A
  4. 8. subatomic particle with positive charge
  5. 11. a type of reaction that gives out heat energy
  6. 12. not a pure substance
  7. 13. a pure substance formed by a chemical reaction
  8. 14. belong to group 7
Down
  1. 1. ________ molecules ;ex. H2, N2, Cl2
  2. 3. the lightest subatomic particles
  3. 4. has a symbol of Na
  4. 5. charged particles
  5. 7. mass __________ is a device used to identify the isotopes and their natural abundance
  6. 9. found inside the nucleus that have neutral charge
  7. 10. ______ number , a vertical column of the Periodic table