Which of the following, I or I-, will have a negative electron affinity?

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Step 1: Understand the concept of electron affinity. Electron affinity is the energy change that occurs when an electron is added to a neutral atom to form a negative ion. It is usually exothermic, meaning it releases energy and thus has a negative value.

Step 2: Consider the neutral iodine atom (I). When an electron is added to it, it forms a negative ion (I-). The process of adding an electron to a neutral atom is usually exothermic, so iodine (I) will have a negative electron affinity.

Step 3: Now consider the iodine ion (I-). If we try to add another electron to it, the process will be endothermic because the incoming electron will be repelled by the negative charge of the ion. Therefore, the electron affinity of I- will be positive.

Step 4: Therefore, among I and I-, only I will have a negative electron affinity.

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Electron Affinity

Electron affinity is the amount of energy released when an electron is added to a neutral atom in the gas phase to form a negative ion. A negative electron affinity indicates that energy is required to add an electron, meaning the process is endothermic. Understanding this concept is crucial for determining the stability of anions and the tendency of elements to gain electrons.

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Electron Affinity

Iodine and Iodide Ion

Iodine (I) is a neutral atom, while the iodide ion (I-) is the anion formed when iodine gains an electron. The electron affinity of iodine can be compared to that of the iodide ion to understand their respective tendencies to accept electrons. This comparison is essential for predicting the behavior of these species in chemical reactions.

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Ion Formation

Trends in Electron Affinity

Electron affinity varies across the periodic table, generally increasing from left to right and decreasing from top to bottom. Halogens, like iodine, typically have high electron affinities due to their desire to achieve a stable electron configuration. Recognizing these trends helps in predicting which species will have a negative electron affinity based on their position in the periodic table.

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