Across
- 1. the number of protons in an element
- 4. when atoms are close together but not bonded
- 5. smallest unit of matter
- 6. subatomic particle with a negative charge
- 8. subatomic particle with no charge
- 10. subatomic particle with a positive charge
- 11. the protons and neutrons are located here
Down
- 2. pure substance made up of only 1 type of atom
- 3. which letter is capitalized in a symbol
- 5. the number of protons and neutrons
- 7. when 2 or more atoms chemically combine
- 9. anything that has mass and takes up space