Chapter 6 - Chapter 6 Ionic Bonds and Some MainGroup...

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Chapter 6 Ionic Bonds and Some Main- Group Chemistry
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Ions and Their Electron Configurations Chapter 2 Metals lose electrons to form cations Main group elements tend to lose the same # of electrons as their group number Nonmetals when combined with metals gain electrons to form anions The number gained = 8 – group # WHY???????
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Ions and Their Electron Configurations Main Group Elements - the number of electrons gained or lost = the number of electrons necessary to obtain the nearest noble gas or pseudo-noble gas configuration (filled d-orbital). Main group metal – the # electrons lost often = # of valence electrons Nonmetal – the # electrons gained = # of electrons necessary to achieve 8 in the valence shell Na, Ne, Na + O, Ne, O 2- K, Ar, K + Cl, Ar, Cl - Ga, Ga 3+ Sn, Sn 4+
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Ions and Their Electron Configurations Transition element ions formed by 1 st losing their valence electrons 2 nd losing d-orbital electrons to obtain the charge Fe 2+ Fe 3+ Co 2+ Co 4+ Ag + Zn 2+
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Problem Select the correct set of quantum numbers ( n, l, m l , m s ) for the first electron removed in the formation of a cation for strontium, Sr. A. 5, 1 , 0, -½ B. 5, 1, 0, ½ C. 5, 0, 1, ½ D. 5, 1, 1, ½ E. 5, 0, 0, -½
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Ionic Radii Effect of charge on ionic radii evaluated using atomic size and Z eff Atomic size increases with increasing energy levels – Z eff Cation – more protons than electrons – stronger attraction Anion – less protons than electrons – weaker attraction Cation < Neutral atom < anion
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This note was uploaded on 02/26/2010 for the course CHE 107 taught by Professor Keister during the Spring '07 term at SUNY Buffalo.

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Chapter 6 - Chapter 6 Ionic Bonds and Some MainGroup...

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