Atoms & Molecules

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Across
  1. 1. Acts or reacts in a certain way.
  2. 4. Everything that exists, including stars, planets, and space.
  3. 8. A scientist who studies matter, energy, and how the world works.
  4. 10. Smaller than the basic building blocks of matter.
  5. 12. A pure substance made of only one kind of atom.
  6. 15. Relating to the basic building blocks of matter.
  7. 16. A colorless gas and the lightest element.
  8. 18. Very tiny pieces of matter.
  9. 20. Scientist who developed modern atomic theory.
Down
  1. 2. Describes something related to charged particles.
  2. 3. Particles in the center of an atom with no electric charge.
  3. 5. Having a charge that is opposite of positive.
  4. 6. In the end; finally.
  5. 7. Positively charged particles found in the center of an atom.
  6. 9. The center part of an atom containing certain particles.
  7. 11. Negatively charged particles that move around the outside of an atom.
  8. 13. Careful focus of the mind or eyes.
  9. 14. A substance made when two or more elements join together.
  10. 17. Greek thinker who first suggested that matter is made of tiny particles called atoms.
  11. 19. One at a time or separately.