Chemistry

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Across
  1. 3. Combination of 2 or more bonded H elements
  2. 5. Subatomic Particle with a negative electrical charge
  3. 7. The smallest part of a chemical element
  4. 10. Area outside the nucleus where the electrons exist
  5. 11. Averageatomic mass of an element
  6. 12. Central part of an atom made of protons and neutrons determines mass
Down
  1. 1. Arrangement of the chemical elements in rows and columns
  2. 2. The number of protons in the nucleus
  3. 4. Subatomic particle with a positive electrical charge located in the nucleus
  4. 6. Substance that cannot be broken down or changed
  5. 8. number in front of a symbol that represents the number of molecules present
  6. 9. Shows how many atoms of an element are present in a molecule