Chemistry Revision

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Across
  1. 2. The number of protons in an element (6,6)
  2. 4. The vertical columns of the periodic table (6)
  3. 5. The central part of an atom, that contains most of the mass (7)
  4. 7. The horizontal rows of the periodic table (7)
  5. 9. Neutral particles with a relative mass of 1 (8)
Down
  1. 1. Negatively charged particles with a relative mass of 1/2000(9)
  2. 3. The number of protons and neutrons in an element (6,5)
  3. 6. A substance made of just one type of atom (7)
  4. 7. Positively charged particles with a relative mass of 1 (7)
  5. 8. A charged particle formed when an atom gains or loses electrons (3)