Across
- 5. - a negative charged ion
- 8. -SI unit measuring amount of substance
- 9. number-number of protons in an atom
- 10. center of an atom
- 11. smallest particle of an element
- 13. - subatomic particles that make up an atom
- 14. subatomic particle with a positive charge
- 16. formed by two or more elements
Down
- 1. of solid forming into gas
- 2. atomic number of carbon
- 3. substance which cannot be broken down
- 4. what is the chemical element name for Na
- 6. - outermost shell of an atom
- 7. chemical symbol for water
- 12. - type of bond shared between atoms
- 15. a physical substance