Periodic Table

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Across
  1. 3. Sum of protons and neutrons
  2. 4. Smallest particle that can be considered an element
  3. 7. Scientist who created the first periodic table
  4. 9. Dense center of an atom
  5. 10. A particle with no electrical charge
Down
  1. 1. Same # of protons and different # of neutrons
  2. 2. Positive charged particle in atoms
  3. 5. The number of protons in a nucleus
  4. 6. An idea or thought
  5. 8. Negative charged particle in atoms