Across
- 3. found to the left on the line
- 7. created the first periodic table
- 8. numbers what the periodic table is organized by today
- 9. row represents the principal quantum number
Down
- 1. in group 2 has 2 valence electrons
- 2. found to the right of the line
- 3. the elements found on the line
- 4. metals in the first row of the periodic table
- 5. excluded from group 1
- 6. atomic number of 94