Across
- 2. Atomic radius increases going through a _______.
- 7. Half the distance between two adjacent nuclei.
- 8. Gases at room temperature and have eight valence electrons.
- 9. Silvery-white metals that are fairly reactive.
- 12. The energy released when an electron is added to an atom.
- 13. To the right of the stairs.
- 15. The size of an ion.
- 16. Energy The energy required to pull an electron from an atom.
- 17. The electric current cannot flow freely if an element is a(n) __________.
Down
- 1. The elements touching the stairs.
- 3. The tendency of a trend to recur at regular intervals.
- 4. group one
- 5. Metals Groups three through twelve.
- 6. Most transition metals are good _______ of heat and electricity.
- 10. The difficulty for an atom to attract an electron.
- 11. To the left of the stairs on the periodic table.
- 14. vertical rows going down the periodic table.