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Unformatted text preview: Electron Configurations of Cations and Anions of Representative Elements Na [Ne]3s 1 Na + [Ne] Ca [Ar]4s 2 Ca 2+ [Ar] Al [Ne]3s 2 3p 1 Al 3+ [Ne] Atoms lose electrons so that cation has a noble-gas outer electron configuration. H 1s 1 H- 1s 2 or [He] F 1s 2 2s 2 2p 5 F- 1s 2 2s 2 2p 6 or [Ne] O 1s 2 2s 2 2p 4 O 2- 1s 2 2s 2 2p 6 or [Ne] Atoms gain electrons so that anion has a noble-gas outer electron configuration. Chapter 8 Periodic Relationships Among the Elements N 1s 2 2s 2 2p 3 N 3- 1s 2 2s 2 2p 6 or [Ne] Na + : [Ne] Al 3+ : [Ne] F- : 1s 2 2s 2 2p 6 or [Ne] O 2- : 1s 2 2s 2 2p 6 or [Ne] N 3- : 1s 2 2s 2 2p 6 or [Ne] What neutral atom is isoelectronic with H- ? Isoelectronic: have the same number of electrons, and hence the same ground-state electron configuration Electron Configurations of Cations of Transition Metals When a cation is formed from an atom of a transition metal, electrons are always removed first from the ns orbital and then from the ( n 1) d orbitals....
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