Across
- 2. Are not chemicaly bonded together.
- 3. Two or more different types of atoms.
- 4. When atoms of the same type are grouped together.
- 6. a group for the same atoms that are chemically bonded.
- 8. a colorless odorless gas that is non-toxic
- 9. building blocks, can be combined in a variety of ways to create substances.
- 10. Steel is mainly composed of this element.
Down
- 1. a colorless odorless gas that is toxic
- 5. negatively charged subatomic particles.
- 7. anything that has mass and takes up space.