Across
- 2. Number of periods on the periodic table
- 7. J.J. Thomson discovered this
- 10. Group eleven
- 12. The element with 6 protons
Down
- 1. Atom with different number of electrons
- 3. Number of groups on the periodic table
- 4. The atomic mass of Beryllium
- 5. Which period of the periodic table corresponds with Calcium (Ca)
- 6. The elements that touch the zigzag line (staircase) of the periodic table
- 8. Ni
- 9. Ac
- 11. As