Periodic Table crossword

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