Exercises 1. Compare the properties of electrons, protons and neutrons 2. What are the limitations of J.J. Thomson's model of the atom 3. What are the limitations of Rutherford's model of the atom? 4. Describe Bohr's model of the atom. 5. Compare all the proposed models of an atom given in this chapter 6. Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements. 7. Define valency by taking examples of silicon and oxygen. SCIENCE pl
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- "Protons and neutrons have approximately the same mass, but they are both much more massive than electrons (approximately 2,000 times as massive as an electron). The positive charge on a proton is equal in magnitude to the negative charge on an electron. "
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Protons are bound together in an atom's nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no charge (they are neutral). Like protons, neutrons are bound into the atom's nucleus as a result of the strong nuclear force
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