Across
- 2. th mass of an atom
- 4. cannot be chemically interconnected or broken down
- 7. The outermost electron
- 9. it's the powerhouse of the atom
- 11. has a positive charge
Down
- 1. Created the periodic table
- 3. The pattern of an atom
- 5. the number of protons in an atom
- 6. Makes up matter
- 8. has a negative charge
- 10. H2o