Across
- 2. how much matter an object is made up of
- 3. the negatively charged part of an atom
- 4. the part of the atom that has no charge
- 7. the name of the element
- 10. (weight) P+N Protons plus neutrons
- 12. the positively charged part of an atom
Down
- 1. letters that represent the element
- 5. a substance made of an atom that stays the same
- 6. the center of an atom
- 8. the smallest whole unit of matter
- 9. P=E Number of protons equal to electrons
- 11. anything that has mass and takes up space