Across
- 3. found on left side of stairstep on periodic table
- 6. indicates number of protons in an atom
- 10. letters that represent elements
- 11. negatively charged particles around the nucleus
- 12. indicates elements with same # of valence electrons
Down
- 1. indicates total number of protons/neutrons
- 2. positively charged particle in an atom's nucleus
- 4. found on right side of stairstep on PT
- 5. horizontal row on the periodic table
- 7. same # of protons and different # of neutrons
- 8. found along the stairstep line of PT
- 9. neutral particle in the nucleus of an atom