Across
- 2. horizontal line in periodic table
- 3. electron the name of electrons on the last shell of an atom
- 5. elements from group 17
- 6. vertical column in periodic table
- 8. A table containing elements
Down
- 1. founder of periodic table
- 4. an inert gas
- 5. first element in the periodic table
- 7. positive charge in the nucleus
- 8. chemical formula of iron