The Periodic Table Crossword

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