Chemistry

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Across
  1. 3. Number of protons in an atom
  2. 4. Pure substance made of only one type of atom
  3. 6. Positively charged particle in the nucleus
  4. 8. Vertical column in the periodic table
  5. 9. A change that forms a new substance
  6. 12. Atoms of the same element with different numbers of neutrons
  7. 13. Center of an atom
  8. 14. Simplest type of pure substance that can’t be broken down
Down
  1. 1. Horizontal row on the periodic table
  2. 2. Table organizing all known elements
  3. 3. Smallest unit of matter
  4. 5. Negatively charged particle orbiting the nucleus
  5. 7. Particle with no charge in the nucleus
  6. 10. Number that changes between isotopes
  7. 11. Mixture that looks the same throughout