Isoelectronic Species and Effective Nuclear Charge

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Presentation transcript:

Isoelectronic Species and Effective Nuclear Charge

Isoelectronic Ions Have the same number of electrons Na+ has 11 protons, a nuclear charge of +11. F- has 9 protons, a nuclear charge of +9. Na+ has a smaller ionic radius than F- Isoelectronic Ions Number of electrons Na+, F- 10 e- S2-, Cl-, K+, Ca2+ 18 e-

Isoelectronic Ions S2- has 16 protons, a nuclear charge of +16. Number of electrons Na+, F- 10 e- S2-, Cl-, K+, Ca2+ 18 e- S2- has 16 protons, a nuclear charge of +16. Cl- has 17 protons, a nuclear charge of +17. K+ has 19 protons, a nuclear charge of +19. Ca+2 has 20 protons, a nuclear charge of +20. Ca+2 < K+ < Cl- < S2- (smallest) (largest)

Isoelectronic Ions For isoelectronic ions, the radius decreases as the positive nuclear charge increases.