6a vocab
Across
- 1. cloud region around nucleus
- 3. table an arrangement of elements in order of their atomic numbers
- 4. uncharged particles
- 6. number number of protons in a nucleus
- 7. number sum of the number of protons and neutrons in a nucleus
- 9. positively charged particles
Down
- 2. negatively charged particles
- 5. center of an atom
- 8. smallest particle in an element