Periodic table

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Across
  1. 2. The fundamental building block of matter
  2. 4. An element that rarely reacts with other elements
  3. 6. The smallest element
  4. 7. The largest naturally occurring element
  5. 9. An element that reacts easily with other elements
  6. 12. Atomic number
  7. 13. In an atom it has a negative charge
  8. 14. Element number six
Down
  1. 1. Central core of atom
  2. 3. Created the first periodic table
  3. 5. In an atom it has no charge
  4. 8. Symbol for gold
  5. 10. The sum of the weights of protons, neutrons, & electrons
  6. 11. In an atom it has a positive charge
  7. 12. Symbol for sodium