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Animation - Electron Affinity Electron affinity is the measure of the attraction of an electron toward an isolated gaseous atom. When an electron is added to an isolated gaseous atom or ion energy is either released or absorbed; this energy change is known as electron affinity. Electron affinity is positive when energy is absorbed, and it is negative when energy is released. Watch the video to learn more about electron affinity. Part A Watch the video on electron affinity and identify which of the following statements are correct. Check all that apply. Hints O When any neutral gaseous halogen atom accepts an electron, it is an exothermic process When a gaseous O ion accepts an electron, it is an endothermic process. Electron affinity is a measure of the energy change associated with the removal of an electron from an atom. The electron affinity value of a gaseous O ion is -710 kJ. The electron affinity value of a neutral gaseous O atom is-142 kJ.

Explanation / Answer

Part 1)

a) correct.

When any neutral gaseous halogen atom accepts electron, it is an exothermic process.

b) When a gaseous O- ion accepts electron it is endothermic process.

COrrect. It is due to the repulsions beteen the existing and incoming second electron.

c)False.

electron affinity is the measure of energy associated with addition of electrn to the atom.

d) wrong. The second electron affinity of an atom (EA of O-) is positive not negative(endothermic.

e) correct.The Forst EA of O is -142kJ/mol

Part B

1) F- + e -----> F-2 endo thermic , positive EA

Br + e ------> Br- , negative EA

Na + e ---------> Na_ negative Ea

He + 1e ------> He- , positive EA (endothermic)

Mg + 1e --------> Mg- ,, positive EA (endothermic)

part C

The most negative EA is for Br (by taking one electron attains stable octet configuration)and the least negative EA is for Kr (already has stable octet. So resists additiono of extra electron)

Thus the order is Br , Ge, Kr

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