Across
- 3. a variable which is not changed in an experiment
- 5. a charged atom
- 7. has a valency is of 4
- 9. group 7 on the periodic table
- 10. multiple elements together
- 11. has a mass of 14.01
- 13. atomic number of 83
Down
- 1. outer shell on a bohr shell model
- 2. a change in state which irreversible
- 4. needs oxygen in the equation
- 6. what is the elements name for h20
- 8. has 10 protons
- 10. group 6 period 4
- 12. a change in state which is reversible