Across
- 4. A region in space with a high probability of finding an electron.
- 7. This spectrum consists of a dark background with coloured lines.
- 9. When burnt, this emits a yellow colour.
- 12. An element with a mass number of 19.
- 13. The colour of a ring formed while testing for nitrates.
- 14. A type of radiation consisting of one proton and one neutron.
- 15. A negatively charged particle.
Down
- 1. One of the four basic elements proposed by the Greeks.
- 2. Discovered the proton and nucleus.
- 3. Devised the oil-drop experiment.
- 5. A form of bonding where atoms share electrons.
- 6. Radiation with a very high penetrating power.
- 8. The shape of an s orbital.
- 10. Proposed atomic theory in 1808.
- 11. A thick slab of this can block gamma radiation.