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This is because going from left to right and bottom to top, the atomic radius decreases so it is easier for the nucleus to attract negative electrons. Electron affinity (the energy associated with forming an anion) is more favorable (exothermic) when electrons are placed into lower energy orbitals, closer to the nucleus. Therefore, electron affinity becomes increasingly negative as we move left to right across the periodic table and decreases as we move down a group. This trend of lower electron affinities for metals is described by the Group 1 metals: Lithium (Li): -60 KJ mol -1 Sodium (Na): -53 KJ mol -1 Potassium (K): -48 KJ mol -1 Rubidium (Rb): -47 KJ mol -1 Cesium (Cs): -46 KJ mol -1 Electron affinity is the affinity of an element to an electron. This is measured by the energy released when an element in its gaseous state accepts an electron to form an anion. So this is an exothermic reaction.

Notice that the 1st electron affinity of fluorine does not follow the group trend. electronic-configuration periodic-trends electron-affinity. Share. Improve this question.

Electron Affinity - Google Search Electron affinity, Chemistry

Electron Affinity Ionization Electron affinity shows an irregular trend. It first increases from B to Al and then decreases. · From Al to Tl, electron affinity decreases.

Elektronaffinitet - Electron affinity - qaz.wiki

2020-06-16 · Electron affinity is the energy change that occurs as an atom gains electrons. Trends of the electron affinity include the following: Electron affinity increases across the periodic table from left to right due to nuclear charge increases. It also increases from bottom to top in the periodic table due to atomic size. Elements. Electron affinity can be defined in two equivalent ways.

Electron affinity Definition: The energy released when an electron is added to a gaseous atom which is in its ground state to form a gaseous negative ion is defined as the first electron affinity. The symbol is EA, and the unit is kJ/mol.
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2019-03-02 · Electron Affinity Definition in Chemistry Electron Affinity Trend. Electron affinity is one of the trends that can be predicted using the organization of elements Uses of Electron Affinity. Keep in mind, electron affinity values only apply to gaseous atoms and molecules because the Electron Electron affinity follows the trend of electronegativity: fluorine (F) has a higher electron affinity than oxygen (O), and so on. The trends noted here are very similar to those in ionization energy and change for similar (though opposing) reasons.

Electron affinity decreases down the groups and from right to left across the periods on the periodic table because the electrons are placed in a higher energy level far from the nucleus, thus a decrease from its pull. Click to see full answer. Elements.
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It increases moving down a column or group and also increases moving from left to right across a row or period (except for the noble gases). The value may be either positive or negative.