Across
- 2. The amount of matter in an object.
- 3. The smallest unit of an element.
- 6. A particle with no electric charge.
- 9. A positively charged particle found in the nucleus.
- 10. A particle with a negative charge.
Down
- 1. Having a greater number of protons than electrons.
- 4. A horizontal row in the periodic table.
- 5. A vertical column in the periodic table.
- 6. The opposite of positive.
- 7. The center of an atom that contains protons and neutrons.
- 8. A one- or two-letter abbreviation for an element.