An electron loses potential energy when it:

a. shifts to a less electronegative atom

b. shifts to a more electronegative atom

c. increases its kinetic energy

d. increases its activity as an oxidizing agent

e. moves further away from the nucleus of the atom

B that is electron  Shifts to a more electronegative atom

Explanation:

Electron loses potential energy when  Shifts to a more electronegative atom. In an reduction-oxidation reaction, when an electron comes in proximity of high electronegative atom, it tends to lose some energy in form of potential energy.  Electrons have more energy potential when associated with less electronegative atoms (such as C or H) and less energy potential when associated with a more electronegative atom (such as O).

hence the correct answer is B that is electron  Shifts to a more electronegative atom

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