periodic table

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Across
  1. 4. smallest unit of matter
  2. 6. part of the atom with no charge
  3. 8. negatively charged part of an atom
  4. 9. a substance made of just one type of atom
  5. 10. the # of protons that is equal to the # of electrons
Down
  1. 1. positively charged part of an atom
  2. 2. the letters that represents the element
  3. 3. name of the element
  4. 5. the number of protons + neutrons
  5. 7. center of an atom