Periodic Table Cross Word

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Across
  1. 3. the number of protons and neutrons in atoms nucleus
  2. 5. subatomic particle with neutral charge
  3. 8. number of protons in an atoms nucleus
  4. 12. year the periodic table was invented
  5. 13. the organised arrangement of elements
  6. 14. discovery of the neutron
  7. 15. who created the periodic table
  8. 16. a type of chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals.
  9. 18. atomic number of 1
  10. 19. the smallest component of an element
  11. 20. subatomic particle with positive charge
Down
  1. 1. center of atom
  2. 2. electrons in outermost shell
  3. 4. two or more elements combined
  4. 6. fundamental substances that consist of atoms
  5. 7. what all things are made of
  6. 9. elements that form positive ions and has metallic bonds
  7. 10. An attractive force that allows the element to be formed
  8. 11. dull, non conductive elements
  9. 17. subatomic particle with negative charge