Simple periodic table recap

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Across
  1. 2. K
  2. 7. Group 0, period 3
  3. 8. A substance made up of one or more atoms chemically bonded together.
  4. 10. Fe
  5. 11. A substance that is only made up of one type of atom.
  6. 12. The horizontal rows of the periodic table.
Down
  1. 1. The vertical columns of the periodic table.
  2. 3. A one or two letter representation of an element.
  3. 4. Group 4, period 1
  4. 5. The smallest particle of matter that makes up all substances.
  5. 6. Group 1, period 3
  6. 9. A substance that has more than one type of atom. Can be an element or a compound.