Periodic Table crossword

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Across
  1. 5. Characteristics of a particular substance that can be observed
  2. 6. An element that's properties are intermediate between those of metals and solid semiconductors
  3. 8. An element that is not a metal
  4. 10. The smallest unit of ordinary matter
  5. 12. Vertical columns of the periodic table
  6. 14. Symbol used to identify an element
  7. 16. Positively charged subatomic particles
  8. 17. Table of elements
Down
  1. 1. The mass of an atom
  2. 2. An element characterized by high electrical and thermal conductivity
  3. 3. Neutral charged subatomic partivles
  4. 4. Horizontal rows of the periodic table
  5. 7. The outside part of an atom's nucleus
  6. 9. Negatively charged subatomic particles
  7. 11. Bond between two atoms of similar electron amount
  8. 13. The centre of an atom
  9. 14. Number of protons in the nucleus of an atom
  10. 15. Russian chemist who created the periodic table