The Periodic Table

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Across
  1. 5. A small particle that makes up elements.
  2. 8. A group of metals that change the amount of electrons in its outer shell.
  3. 9. A gas that goes around in pairs in the air.
  4. 10. One of the eight vertical columns in the periodic table
  5. 11. A substance with more than one type of atom joined together.
  6. 14. A substance that cannot be broken down into anything simpler.
  7. 16. A metal that is made with specific properties of other metals
  8. 17. A metal that can be magnetized.
  9. 18. A sub-atomic particle with a positive charge and a relative mass of one.
Down
  1. 1. Group one metal.
  2. 2. A substance where the particles are free to move.
  3. 3. A member of group seven.
  4. 4. A group of atoms joined together.
  5. 6. A material/substance that contains more than one substance.
  6. 7. Charged particles.
  7. 12. A material that is usually solid and shiny, some are magnetic.
  8. 13. One of the seven horizontal rows in the periodic table
  9. 15. An element named after a planet.