what is the result of SGN(-7.5)
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The electron affinity ( EA ) of an element E is defined as the energy change that occurs when an electron is added to a gaseous atom or ion:
E(g)+e−→E−(g) energy change=EA(7.5.1)
Unlike ionization energies, which are always positive for a neutral atom because energy is required to remove an electron, electron affinities can be negative (energy is released when an electron is added), positive (energy must be added to the system to produce an anion), or zero (the process is energetically neutral). This sign convention is consistent with a negative value corresponded to the energy change for an exothermic process, which is one in which heat is released
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