The Periodic Table

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Across
  1. 2. A colourless, odourless reactive gas
  2. 4. Relating to and atom or atoms
  3. 7. Relating to chemicals
  4. 10. Chemical element with an atomic number of 17
  5. 11. A particle with a net electrical charge
  6. 12. Arrangement of interrelated elements
Down
  1. 1. Boiling point is lowest amongst all elements
  2. 3. Loss of electrons during a reaction by an ion
  3. 5. A subatomic particle
  4. 6. Commonly known as quicksilver
  5. 8. The essential part of something abstract
  6. 9. Reactive metal of the alkali metal group