The periodic table

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Across
  1. 3. The number of protons in an atom is called?
  2. 5. The name of the columns in the Periodic Table
  3. 6. The part of an atom with a neutral charge
  4. 7. The abbreviations used in chemistry for chemical elements is called a?
  5. 8. The part of an atom with a positive charge
Down
  1. 1. Where elements are sorted
  2. 2. The part of an atom with a negative charge
  3. 4. The name of the rows in the Periodic Table