Across
- 1. Group A elements
- 4. Vertical columns on PT
- 5. Horizontal rows on PT
- 7. "Father of the Periodic Table"
- 9. Group B elements
Down
- 2. The repeating pattern of elements when arranged in order of atomic number
- 3. Electrons in outermost energy level
- 6. Semimetals on the staircase
- 7. Left side of PT
- 8. Right side of PT