Periodic Table

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Across
  1. 4. 1 to 2 letter for name.
  2. 5. what element has the atomic number of 8
  3. 6. in order
  4. 7. average mass of elements and isotopes.
  5. 8. number of protons in a elements atom
  6. 9. Who made the first periodic table?
Down
  1. 1. Process of representing.
  2. 2. discovered 63 elements
  3. 3. how did Mendeleev order the periodic table
  4. 6. Shows elements in order