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Across
  1. 3. This scientist created a system to visualize valence electrons using dots. The system was named after him.
  2. 4. the branch of science that studies the properties and behaviors of substances
  3. 6. a molecule made up of two or more atoms
Down
  1. 1. the center of the atom that contains most of the mass
  2. 2. a negatively charged particle that has almost no mass
  3. 5. a prediction about something that can be proved through observations