Question

Addition of second electron to an anion is more difficult due to

Answer 1

Answer:

he second electron affinity of Oxygen is positive because after adding 2 electrons to a neutral Oxygen atom (with 4 electrons in the p-subshell), it attains a noble gas configuration.

Answer 2

The addition of a second electron to an anion is more difficult due to the increased electron-electron repulsion that occurs with the second electron.

Electron affinity:

• The amount of energy released when an electron binds to a neutral atom or molecule in the gaseous state to produce an anion is known as the electron affinity of an atom or molecule.
• Only a few chemical elements, primarily halogens, have values available since it is difficult to determine the affinities of an atom's electrons.
• Because the electron we added can still be attracted to the charged nucleus, energy is released when an electron is added.
• You will therefore obtain a negative result for the electron affinity if the nucleus is attracted to the extra electron.
• Since the electron is added to a negative ion, it must overcome the repulsion, hence the second electron affinity is always endothermic (positive).

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