Across
- 4. A highly energized gas where atoms lose their electrons.
- 5. Molecules are closely packed and vibrate in place.
- 6. The smallest unit of matter.
- 7. Molecules are less packed and move more freely.
Down
- 1. A substance made of one type of atom.
- 2. Molecules are spread far apart and move freely.
- 3. Two or more atoms bonded together.