electron affinity is the negative of electron gain enthalpy.
for example, the electron gain enthalpy of fluorine is -328, and electron affinity is 328 which is -(-328)
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Electron affinity is the energy released when an atom gains an electron to form a negative ion, while electron gain enthalpy is the enthalpy change accompanying the addition of an electron to a gaseous atom. Electron affinity is a specific term used in the context of forming an ion, while electron gain enthalpy is a general term for the enthalpy change associated with gaining an electron.
The electron affinity of germanium is considered to be moderate. Germanium is a metalloid element with an electron affinity that falls between that of metals and nonmetals.
An ionic bond forms when there is a large difference in electron affinity between two atoms. Typically, one atom has a high electron affinity (strongly attracts electrons) and the other atom has a low electron affinity (weakly attracts electrons), leading to the transfer of electrons from one atom to the other to form charged ions that are held together by electrostatic forces.
The difference between the enthalpy of the products and the enthalpy of the reactants in a chemical reaction is known as the change in enthalpy, or H. This value represents the amount of heat energy either absorbed or released during the reaction. If H is positive, the reaction is endothermic and absorbs heat. If H is negative, the reaction is exothermic and releases heat.
One trend in electron affinity is that it generally increases across a period from left to right on the periodic table due to increasing nuclear charge. However, there are exceptions such as the decrease in electron affinity between groups 2 and 13 as a result of increased electron repulsion. Additionally, noble gases have very low or zero electron affinities, contrary to the trend of increasing affinity.
The Hreaction is the difference between Hf, products and Hf, reactants