1. Who had the earliest direct evidence of atoms?How did he come to discover it?
2.How did J.J. Thomson come to discover electrons?
3.What experiment did Rutherford do to show that all the positively charged particles are centered?Explain why he came to believe this
4.What is the difference between Bohr's model and Rutherford's model?
5.Based on the Quantum Mechanical Model,are electrons found in a definite area? If not explain how you would find them .
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