Lec-36-Chap17-1-bare

Lec-36-Chap17-1-bare - Lec-36-Chap17-1-bare Lec-36 Chapter...

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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 1 Lec-36: Chapter 17 Chemistry of Transition Elements and Coordination Compounds 1 p.1046a 2
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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 2 Fig. 7-13, p.296 3 Fig. 7-15, p.300 4
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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 3 Properties of Transition ( d -block) elements Transition ( d -block) elements occupy the central part of the periodic table, from periods 4 to 7. Their properties are intermediate between the s -block metals (very reactive) and the p -block metals (less reactive) . They present a steady progression in properties from those of the s -block to those of the p -block. 5 Properties of Transition ( d -block) elements metals (conduct electricity). ductile and malleable (wires and sheets) silvery or bluish (not Au and Cu) high melting and boiling temperatures (not Hg) high densities (up to 20 g cm –3 ) many form brightly-colored compounds some are paramagnetic, a few are ferromagnetic they form complex ions most have multiple oxidation states (except Zn 2+ , Sc 3+ ) 6
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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 4 Properties of Transition ( d -block) elements The number and distribution of d electrons affect the properties of the transition metal elements. Reactive like Group-II metals Have filled (n-1)d and ns subshells 7 n = 4 n = 5 n = 6 Fig. 7-15, p.300 8
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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 5 Electron Configurations n : period number (4 to 7) x : number of d electrons (up to 10) y : number of s electrons (1 or 2, except Pd) The number of d electrons increases from left to right in each series. All transition elements have the electron configuration   of period 1 noble ga 1 s n y x ns nd   9   10 Pd : Kr 4 d 0 5 s Electron Configurations The progressive filling of d electrons along the first series is not uniform. 10
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Lec-36-Chap17-1-bare 12/2/2011 Transition Metal Chemistry 6 Electron Configurations When transition metals lose electrons to form ions, they first loose the ns electrons and then the (n-1)d electrons.
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Lec-36-Chap17-1-bare - Lec-36-Chap17-1-bare Lec-36 Chapter...

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