Across
- 1. when something takes up space it has ______.
- 4. groups of 'building blocks of matter' bonded together
- 6. what air is mostly made up of
- 8. chemically bonded
- 11. physically can be separated
- 12. have no charge
Down
- 2. has mass and takes up space
- 3. building block of matter
- 5. have a negative charge
- 7. only one type of atom
- 9. determine the atomic number; have a positive charge
- 10. substance when something has one type of atom it is considered a ________________.