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

1. −3.4 eV, −3.4 eV
2. −3.4 eV, −6.8 eV
3. 3.4 eV, −6.8 eV
4. 3.4 eV, 3.4 eV

Correct answer: 3.4 eV, −6.8 eV

Solution

In an atom, the total energy (E) of an electron is the sum of its kinetic energy (K) and potential energy (U). The kinetic energy is equal to the magnitude of the total energy, K = +3.4 eV, and the potential energy is twice the total energy but negative, U = −6.8 eV.

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