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