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Electron Affinity

Electron Affinity. Susmit Sukthankar , Jae Hong Song, Porter Smith, Aakash Balaji. General. is defined as the energy process in which an electron is gained by an atom in its gaseous state Units are KJ/ mol What Affects an Electron Affinity? The overall charge of the atom

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Electron Affinity

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  1. Electron Affinity SusmitSukthankar, Jae Hong Song, Porter Smith, AakashBalaji

  2. General • is defined as the energy process in which an electron is gained by an atom in its gaseous state • Units are KJ/mol What Affects an Electron Affinity? • The overall charge of the atom • the effect of electron shielding • the distance between electrons and the nucleus.

  3. General Trend • Electron affinity decreases as it goes down a column • Electrons are added increasingly farther and farther from the nucleus. Since this distance increases the attractive force between the nucleus and electrons decreases. • The outer electrons experience less of a positive charge as you go down the periodic table (effective nuclear charge)

  4. General Trend • Electron affinity increases as it goes across a period. • The octet rule says that atoms with valence shells close to completion will tend to gain electrons. When they gain the electrons, they use energy, this allows ions to become more stable • The outer electrons experience less of a positive charge as you go across a period (effective nuclear charge)

  5. Exceptions Noble Gases and metals

  6. Graph

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