Across
- 2. Staircase/barrier on the periodic table of metals and nonmetals
- 4. Smallest particle
- 5. Charged particle (cations=+) (anions=-)
- 7. Left side of the periodic table
- 8. Atoms of the same element with a different # of neutrons
Down
- 1. # of protons and neutrons
- 3. # of protons
- 6. Right side of the periodic table