Across
- 2. a measure of how much matter is in an object
- 4. atoms of the same element that have different numbers of neutrons
- 5. center of an atom
- 7. state of matter found in stars, lightning, and the aurora borealis
- 9. a subatomic particle that has a negative charge
Down
- 1. a state of matter with no definite shape or volume
- 2. anything that has mass and takes up space
- 3. a state of matter that has a definite volume but no definite shape
- 6. a state of matter that has a definite volume and shape
- 8. smallest particle of an element