Atoms, elements and compounds

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Across
  1. 2. Particles found inside atoms with a positive charge
  2. 4. Particles found inside atoms with no charge
  3. 7. The name for columns in the periodic table
  4. 8. ?? table, a diagram showing all the elements in the universe
  5. 11. Two or more different elements chemically bonded
  6. 13. a substance made up of only one type of element
  7. 14. The name of the metals found in the middle of the periodic table
  8. 15. The name for rows in the periodic table
  9. 16. Two or more elements chemically bonded
Down
  1. 1. A group of compounds mixed but not chemically bonded
  2. 3. A join between two atoms
  3. 5. Particles found inside atoms with a negative charge
  4. 6. The centre of an atom, made of protons and neutrons
  5. 9. Do the reactions of group 1 metals increase or decrease down the group?
  6. 10. Chemical 'sum' showing the result of a reaction
  7. 12. The smallest things in the universe