chemistry
Across
- 3. anything that has mass and volume
- 5. particle in the nucleus that has no charge
- 7. smallest complete unit of a compound
Down
- 1. smallest particle of an element
- 2. particle of the nucleus (+ charge)
- 4. negatively charged subatomic particle that moves around the nucleus of an atom
- 6. center of an atom; holds protons and neutrons