Science

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Across
  1. 3. subatomic particles with a negative charge
  2. 4. subatomic particles with a positive charge
  3. 9. the number of protons int he nucleus of an atom
  4. 12. a substance made of only one type of atom
  5. 13. the smallest unit of an element
Down
  1. 1. a substance made of atoms from 2 or more elements
  2. 2. organizes the known elements
  3. 5. have equal charges because they have the same number of protons and neutrons
  4. 6. shows which elements and how many atoms of the element are in a compound
  5. 7. tiny center of the atom
  6. 8. 2 or more atoms linked together
  7. 10. symbols the element abbreviations listed on the periodic table
  8. 11. subatomic particles with no charge