Chemistry Cross words

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Across
  1. 2. The smallest unit of a chemical element
  2. 5. The central part of an atom, containing protons and neutrons (7 letters)
  3. 6. A negatively charged particle found in atoms
  4. 9. The number of protons in an atom's nucleus
  5. 10. A change in which one or more substances are converted into new substance
Down
  1. 1. Bond formed when atoms share electrons
  2. 3. The chemical element with the symbol 'O'
  3. 4. The pH level that is neither acidic nor basic
  4. 7. A substance that speeds up a chemical reaction Catal
  5. 8. Table showing all known elements