Periodic Table crossword

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Across
  1. 1. A particle in the nucleus with a positive charge
  2. 4. The different molecules on the periodic table
  3. 7. The number of protons in an element's nucleus
  4. 8. The number of protons and neutrons in an element's nucleus
  5. 10. First name of the inventor of the periodic table
  6. 11. Often known as the rare earth elements, this comprises of fifteen metallic elements
  7. 14. A type of element with good electric conductivity, malleability and ductility
  8. 15. Last name of the inventor of the periodic table
  9. 19. The short name for elements
  10. 20. This element has a symbol of Cl
Down
  1. 2. A particle in the nucleus with no charge
  2. 3. The vertical rows on the periodic table
  3. 5. What elements are made out of
  4. 6. This element has an Atomic Number of 59
  5. 9. A type of element with properties of both metals and nonmetals
  6. 12. Encompasses the fifteen metallic elements with atomic numbers 89 - 103
  7. 13. table The list of elements and their properties
  8. 16. A type of element with bad electric conductivity, bad malleability and ductility
  9. 17. The center of an atom
  10. 18. The horizontal rows on the periodic table