Which statement is true about electron affinity?
Correct answer: D. The value of first electron affinity is always negative
- A. The value of electron affinity is always positive
- B. The value of electron affinity is always negative
- C. The value of first electron affinity is always positive
- D. The value of first electron affinity is always negative
Explanation
Whenever an electron is added to a neutral atom, energy is released out so the first electron affinity is always negative. However, when we add an electron to a negatively charged ion, due to the repulsive force between the negative ion and the negative electron, some energy is needed to overcome this repulsion. The energy which is provided is always greater than the energy released hence the second electron affinity is always positive because, ultimately, energy is provided to the system.
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