Question Video: Determining the Equation that Represents the Electron Affinity of Fluorine | Nagwa Question Video: Determining the Equation that Represents the Electron Affinity of Fluorine | Nagwa

Question Video: Determining the Equation that Represents the Electron Affinity of Fluorine Chemistry • Second Year of Secondary School

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What is the equation representing the electron affinity of fluorine (F)?

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Video Transcript

What is the equation representing the electron affinity of fluorine, F? (A) F gas forms F plus gas plus e minus. (B) F minus gas forms F gas plus e minus. (C) F gas plus e minus forms F minus gas. Or (D) F minus gas plus e minusforms F gas.

In this question, we must identify the equation representing the electron affinity of fluorine.

Electron affinity is the energy released when an electron is added to a neutral atom in the gas state. The correct equation must begin with a neutral fluorine atom in the gaseous state. Since the electron affinity measures the energy released when an electron is added, the equation must also show a negatively charged electron being added to the neutral fluorine atom.

Once an electron is added to a neutral fluorine atom, the fluoride ion is formed, which has a one-minus charge state. No phase change occurs, so the fluoride ion is also gaseous. Therefore, the reactants of the equation would be the chemical symbol for fluorine, F, in the gas state combining with a negative electron to produce a fluoride ion in the gas state. We can see that the equation we have written matches answer choice (C).

Therefore, the equation that correctly represents the electron affinity of fluorine is answer choice (C). F gas plus e minus forms F minus gas.

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