Periodic table

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Across
  1. 3. elements in the same group have similar __________ properties
  2. 4. What did Mendeleev leave in his periodic table
  3. 7. the particles around the outside of the atom
  4. 9. average mass of the atom listed on the table
  5. 10. the columns on the periodic table are called
Down
  1. 1. the number of protons in an atom, which tells you what it is
  2. 2. the elements on the left of the table
  3. 5. used to represent the element name on the table
  4. 6. the rows on the periodic table are called
  5. 8. the middle bit of an atom