The Periodic Table Crossword

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Across
  1. 6. The smallest unit of an element which still maintains the properties of that element
  2. 7. An element which has properties of both metals and nonmetals
  3. 8. The group 7 element
  4. 9. The number of protons within an atom
  5. 10. Positively charged particle found in the nucleus of an atom
  6. 11. A vertical column of the periodic table
  7. 12. A particle with no charge found in the nucleus
  8. 13. A pure substance containing one type of atom
Down
  1. 1. The group 1 element known as
  2. 2. Negatively charged particles that moves around the nucleus
  3. 3. A group of highly stable elements due to their full outer shell of electrons
  4. 4. The number of protons and neutrons in atom
  5. 5. The element with the lowest atomic mass
  6. 10. A row of the periodic table