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Question:
The ground state energy of hydrogen atom is -13.6 eV. What are the kinetic and potential energies of the electron in this state?
Answer:

Ground state energy of Hydrogen atom E = -13.6 eV

Kinetic energy is equal to the negative of kinetic energy

 Kinetic energy = -E = - (-13.6) = 13.6 eV

potential energy is equal to the negative of two time of kinetic energy

Potential energy = - 2 x 13.6 = - 27.2 eV

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