Atomic Structure

1. curie and his wife he stated that radioactive materials cause atoms to break down spontaneously.
5. Rutherford he worked on nuclear physics and on his theory about the the structure of the nucleus.
6. the ion with positive charge.
7. chadwick he measured the energy of the protons emerging from the hydrogen atoms.
9. he proposed that everything is composed of very small bit of matter that is indivisible and called it atom.
11. the ion with negative charge.
13. he proposed that all substances are composed of four elements.
16. he explained that like fluids repel and unlike fluids attract.
19. he clarified the concept of an element as a simple substance that could not broken down by any known method of chemical analysis.
20. it has no net electrical charge.

2. Millikan he was known in atomic physics and major science dealing with the fundamental constituents of the universe.
3. it has an electrical charge of negative one.
4. its has an electrical charge of positive one.
8. number each element has distinctive number of protons. thus, the unique number is known as the?
10. he divided matter into four elements.
12. Dalton he gathered all the findings made by the ancient philosophers and results of various experiments.
14. Einstein was known for the special and general theories of relativity.
15. Crooks he constructed the forerunner of the modern television .
17. Planck he stated that energy is radiated in small, discrete units, which he called quanta.
18. Roentgen discovered x ray by observing the fluorescence they produced.