Question

Electron affinity is positive when​

Answer 1

Answer:

The electron affinity is defined as the energy change that occurs when an atom gains an electron, releasing energy in the process. ... If a reaction is exothermic, the change in energy is negative. This means that the electron affinity is positive.

Answer 2

Answer:

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Explanation:

The electron affinity is defined as the energy change that occurs when an atom gains an electron, releasing energy in the process. Let's remember that an electron is negatively charged, so when an atom gains an electron, it becomes a negative ion.

An Atom Gaining an Electron

Since we are talking about a change in energy, when an electron is added to an atom, there is an equation used to determine the electron affinity:

Electron Affinity Equation

This equation shows that electron affinity is equal to the negative change in energy. Let's clarify the sign convention for the energy change associated with the gain of an electron. Remember that the definition of an electron affinity is the energy released, so that means that the reaction is exothermic. If a reaction is exothermic, the change in energy is negative. This means that the electron affinity is positive.