Chemistry

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Across
  1. 2. Ability to burn, produces ash.
  2. 4. Formation of a new substance.
  3. 5. Mass of protons and neutrons.
  4. 7. Made of one type of atom.
  5. 11. Negatively charged, in outer shell.
  6. 12. Different substances not chemically combined.
  7. 13. Horizontal rows, number of electron shells.
  8. 14. Neutral particle, in the nucleus.
Down
  1. 1. Vertical columns, same valence electrons.
  2. 3. Number of protons/electrons in an atom.
  3. 6. Observed by changing chemical identity.
  4. 8. Positively charged, in the nucleus.
  5. 9. Two or more atoms chemically bonded.
  6. 10. Different elements chemically bonded.