Physical and Chemical Change

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Across
  1. 3. pure substance composed of one type of atom.
  2. 7. carry a positive electric charge.
  3. 9. Amount of protons in an atom.
  4. 11. A gas transforming into a solid.
  5. 12. cluster at the centre of an atom.
  6. 14. When a liquid transforms into a solid.
  7. 15. describes an element.
Down
  1. 1. move in the space outside the nucleus.
  2. 2. A solid transforming into a gas.
  3. 4. When a liquid transforms into a gas.
  4. 5. have mass but no electrical charge.
  5. 6. The average mass of atoms in an element.
  6. 7. Horizontal rows of a periodic table.
  7. 8. Vertical columns of a periodic table.
  8. 10. When a solid becomes a liquid.
  9. 13. When a gas becomes a liquid.