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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
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element
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Transition metals are d-block elements (elements that fill electron in the D sub-shell) that form at least one
ion with an incomplete d sub-shell. Most elements in the d-block are transition elements except:

Scandium- only forms…

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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
ion
element
s




Co 27 [Ar] 4s2 3d7

Ni 28 [Ar] 4s2 3d8

Cu 29 [Ar] 4s1 3d10

Zn 30 [Ar] 4s2 3d10




Properties of transition metals include:

Metallic properties
Variable oxidation states- Transition elements (Ti-Cu) all form ions…

Page 3

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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
ion
element
s





Ligands Formula Change

water :OH2 Neutral

Ammonia :NH3 Neutral

Thiocyanat :SCN- -1
e

Cyanide :CN- -1

chloride :Cl- -1

hydroxide :OH- -1



Complex ions are formed within a solution when a central metal ion is surrounded…

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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
ion
element
s




Optical isomers- forms in octahedral complexes containing multidentate ligands when:
o A complex with three bidentate ligand
o A complex with two bidentate ligand and two monodentate ligand
o A complex with one hexadentate ligand

Cis-platin…

Page 5

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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
ion
element
s





Stability constant (Kstab) of a complex ion is the equilibrium constant for the formation of a complex ion in a
solution, from its constituent ions. It indicates the position of the equilibrium lies to the right,…

Page 6

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Sameer Biology
Jahabarali


Unit 5 Modul
e 3 Tr
ansi
t
ion
element
s





Cr2O72- 2Cr3+ Cr2O72- + 14H++ 6e¯ 2Cr3+ + 7H2O Cr2O72- + 14H+ +6Fe2+ 2Cr3+ + 6Fe2+ +
7H2O
Cr: 6+ 3+

Fe2+ Fe3+ + e¯

I¯ ½ I2 Cr2O72- + 14H++ 6e¯ 2Cr3+ + 7H2O Cr2O72-…

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