Atomic Trends: Electron Affinity

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Presentation transcript:

Atomic Trends: Electron Affinity Definition: Electron Affinity (E.A.) An atom’s E when an electron is added. (+) Endothermic Energy is required as the additional electron is added. Atom’s internal energy goes up. “Unwelcome electron” since additional E is required (-) Exothermic Energy is release as the additional electron is added Atom’s internal energy goes down. “Welcome electron” energy is released

Atomic Trends Atomic Size: Size of atom Large E.A. Small atoms Large atoms Atomic Size: Size of atom Large E.A. Small E.A. Electron Affinity (E.A.) Energy released/absorbed with the addition of an extra e- Large I.E. Small I.E. Ionization Energy (I.E.) Energy required to remove an e-

Atomic Trends: Electron Affinity B 5 10.811 C 6 12.011 N 7 14.007 O 8 16.000 F 9 18.998 Ne 10 20.18 (+) Endothermic Un-Welcome e- -50 -100 -150 -200 -250 -300 -350 +50 N Ne e- UN-welcome B Already full! 1s22s22p6 C O e- Welcome e- Welcome 1s22s22p2 (-) Exothermic 1s22s22p5 + 1e- F + 1e- Welcome e- 1s22s22p3 1s22s22p6 (...becomes ½ full!) (...becomes full!)