Across
- 2. the liquid used to test for carbon dioxide
- 4. reactions that involve a substance reacting with oxygen
- 8. the gas that produces a lit splint with a squeaky pop
- 10. the charge that neutrons have
- 12. reactions that take in energy from the surroundings
Down
- 1. the gas released when a metal carbonate is heated
- 3. positively charged subatomic particles
- 5. the maximum number of electrons that the second and third shells can hold
- 6. reactions that release energy to the surroundings
- 7. the subatomic particles that are on shells
- 9. the centre of the atom
- 11. hydrated iron (III) oxide