Chemistry Project

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Across
  1. 2. middle part of atom
  2. 4. subatomic particle with negative charge
  3. 6. subatomic particle with positive charge
  4. 7. the smallest unit of matter
  5. 8. hint to know the number of valence electrons
  6. 9. hint to know the number of energy levels
  7. 10. anything that has mass and takes up space
Down
  1. 1. a substance that consists of atoms that all have the same number of protons
  2. 3. outer part of atom
  3. 4. layers where electrons could be found
  4. 5. subatomic particle with neutral charge