Across
- 3. Vertical on the periodic table
- 4. Founder of the Periodic table
- 8. The electron in the outer most shell
- 9. The distance between the nuclei and the outermost atom
- 10. Horizontal on the periodic table
Down
- 1. group 17 on the periodic table
- 2. The first element in the periodic table
- 5. the measure of an atom ability to attract another electron to itself
- 6. The energy required to remove an electron from an ion
- 7. first word Group 18 on the periodic table