Chemistry

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Across
  1. 3. Atom or molecule with a net electric charge
  2. 7. Atoms of the same element with different numbers of neutrons
  3. 12. Negatively charged particle
  4. 13. Two or more atoms bonded together
  5. 14. Connection between atoms
  6. 15. Positively charged particle
  7. 16. Electrons in the outer shell of an atom
  8. 17. Substance that speeds up a chemical reaction
  9. 20. Pure substance consisting of one type of atom
Down
  1. 1. Substance that donates protons
  2. 2. Substance that accepts protons
  3. 4. Center of an atom containing protons and neutrons
  4. 5. Substance that dissolves a solute
  5. 6. Substance dissolved in a solvent
  6. 8. Neutral particle in the nucleus
  7. 9. Substance composed of two or more elements
  8. 10. Process of chemical change
  9. 11. Table of elements
  10. 15. Measure of acidity or basicity
  11. 18. Basic unit of a chemical element
  12. 19. Product of an acid-base reaction