Across
- 4. the elements in the middle of the periodic table.
- 7. the electrons in the outer shell.
- 8. the elements in the 18th column.
Down
- 1. the properties of elements based on location on the periodic table.
- 2. the elements in the 1st column.
- 3. the elements in the second row.
- 5. the way electrons are arranged.
- 6. the elements in the 17th column.