Question

ionization energy and electron affinity are defined at
1 enthalpy
2 spontaneity
3 equilibrium
4 absolute zero
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Answer 1

Answer:

The electron affinity (Eea) of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.[1]

X(g) + e− → X−(g) + energy

Note that this is not the same as the enthalpy change of electron capture ionization, which is defined as negative when energy is released. In other words, this enthalpy change and the electron affinity differ by a negative sign. Overall we can say that electron affinity is property of an atom or molecule to gain electron and measure in negative sign of released energy.

In solid state physics, the electron affinity for a surface is defined somewhat differently (see below).

Explanation:

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