Scientific Crossword

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Across
  1. 5. Ions with a positive charge
  2. 6. Chemical elements in order of atomic number
  3. 8. An atom with a net electric charge due to loss or gain of electrons
  4. 9. Made up entirely of one type of atom
  5. 10. A branch of physical science
  6. 13. No electric charge
Down
  1. 1. Ions with a negative charge
  2. 2. Emission of ionising radiation or particles
  3. 3. Made from different elements
  4. 4. Has a charge of negative electricity
  5. 5. When reactants contact each other
  6. 6. Has a charge of positive electricity
  7. 7. Made up of two or more substances
  8. 11. Surronds the nucleus of an atom
  9. 12. Made up of protons, neutrons, electrons