Across
- 1. A molecule made of two hydrogen and one oxygen atom
- 6. An organized table of all of the different kinds of atoms
- 8. The negative charges that orbit around the nucleus of an atom
- 9. The amount of matter in an object
- 10. The amount of space something takes up
Down
- 1. The pull of gravity on matter
- 2. A substance made of only one kind of atom
- 3. Anything that has mass and takes up space
- 4. Two or more atoms combined
- 5. The center of an atom
- 7. The smallest unit of matter