Atomic Theory

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Across
  1. 2. My atomic mass is 35.453 (use the periodic table to help you)
  2. 3. I have 26 protons (use the periodic table to help you)
  3. 5. I am a gas with a mass number of 19 (use the periodic table to help you)
  4. 7. The number of _____________ equals the atomic number
  5. 8. First developed the periodic table (last name)
Down
  1. 1. the mass of protons and neutrons in an atom
  2. 4. In the periodic table, this describes atoms with similar properties
  3. 6. Scientist who developed the “plum pudding model”