Chemistry :)

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