chemistry crossword

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Across
  1. 4. a tiny partical with a negative charge wich orbit the nucleus
  2. 6. the smallest part of an element that can still be recognised
  3. 7. the rows that go across the periodic table
  4. 8. a substance made up of only one type of atom
  5. 10. the number of protons
Down
  1. 1. a small partical found in the nucleus of an atom and carries no charge
  2. 2. elements in order of the atomic numbers
  3. 3. the rows that go down the periodic table
  4. 5. the number of protons plus nuetrons in the neuclus of an atom
  5. 9. a postive partical found inside the nucleus of an atom
  6. 11. an atom that has the same number of protons but differnt number of neutrons
  7. 12. the central part of an atom