Across
- 4. study of physical materials that make up our world
- 7. substances made of 2 or more different elements that can be separated
- 8. substance made from one kind of atom
- 9. protons + neutrons
- 11. particles of matter with no charge
- 12. has definite shape and volume
- 15. ions that are negatively charged
- 16. particles of matter with a positive charge
- 17. ions that are positively charged
- 18. does not have definite shape or volume
Down
- 1. the center of an atom
- 2. particles of matter with a negative charge
- 3. building blocks of life that have mass and take up space
- 5. conforms to the shape of its container and has definite volume
- 6. how large an atom is
- 10. substance made up of 2 or more different elements bound together in a constant ratio
- 13. atoms that are not electrically balanced
- 14. tiny particles that make up matter
- 16. hot gas whose matter is broken into charged particles