Across
- 4. Has a negative charge
- 6. An atom with a net electric charge due to the lose or gain of electrons
- 7. Built up of protons, neutrons and electrons
- 8. Emission of ionising radiation
- 11. A list of atoms in atomic order
- 13. A substance made by mixing other substances together
- 14. Has a neutral charge
- 15. Electrons are kept in these
Down
- 1. A negatively charged ion
- 2. What is it called when reactants contact each other
- 3. A positively charged ion
- 5. Built from two or more separate elements
- 9. The study of matter
- 10. Has a positive charge
- 12. Made up entirely of one atom