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4. In the hydrogen atom, what is the total energy of an electron that is in an orbit that has a radius of 4.78 x 10-10 m? X (hi can you pls explain how to do this correctly? thank you!

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E= - Ke^2/2r Z -> atomic no. e-> charge on electron r-> radius of the orbit hence E = -1 X 9X10^9 X (1.6X10^-19)^2/(2 x 4.78

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