Homework

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Across
  1. 2. electrons spin around ______
  2. 6. part of an atom
  3. 8. centre of atom
  4. 9. in shell of atom
Down
  1. 1. Mendeleev made one
  2. 3. smallest atomic number
  3. 4. smallest unit
  4. 5. creator of his own periodic table
  5. 7. the subject we are doing