The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively:

1. A. 3.4 eV, 3.4 eV
2. B. -3.4 eV, -3.4 eV
3. C. -3.4 eV, -6.8 eV
4. D. 3.4 eV, -6.8 eV

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