Development of the Atomic Theory

3. Physicist who proposed the quantum model of the atom where electrons are represented by areas where electrons are more likely to be found.
7. Type of radiation which consists of a burst of protons.
8. Physicist who discovered the electrons through the use of cathode ray tubes.
9. Subatomic particle with a negative polarity that moves at the speed of light around the atomic nucleus.
10. Spontaneously emitted waves of particles released by different elements as discovered by Marie and Pierre Curie.
12. Subatomic particle with neutral polarity that has a mass of 1 amu and is found in the nucleus of the atom.
15. Physicist who proposed the idea that atoms have a tiny nucleus that comprises the matter in an atom.

1. Physicist who stated the "uncertainty principle" regarding the position of electrons moving at the speed of light.
2. Amount of energy required to be absorbed by an electron in order to jump to the next energy level in the atom.
4. Small area in the center of the atom that contains the 99.99% of all the matter that makes up the atom.
5. Type of radiation which consists of a burst of neutrons.
6. Physicist who find different energy levels within the atom were electrons move showing a wave-like behavior.
11. German physicist who invented the first device used to measure radiation.
13. Subatomic particle with a positive polarity that has a mass of 1 amu and is found in the nucleus of the atom.
14. Type of radiation which consists of a burst of electrons.