1) Explain the key contributions of Dalton in the atomic theory. 2) Who discover the electron, and how did he/she discover it? 3) State the principle of Conservation of Mass 4) Explain the quote and quote idea " nothing come from nothing" 5) What is Law of Definite Proportion? Give one example of this law. 6) Give one of the six postulates that involve in the Daltons Atomic Theory. 7) Because of the Modern Chemistry. Modern Chemist study again the Daltons Atomic Theory, give me one postulate that have drawbacks in this postulates. 8) Who discovers Proton, and what is the experiment used to discover it? 9) Differentiate the properties of the subatomic particles. 10) What is Quantum Theory> and Who is the scientist who proposed about it? 11) What are isotopes and how it differs from the other elements? 12) What is atom? How it differs from matter?

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