Transition Metals

5.3.1 OCR A A-level chemistry

Which 2 transition metal atoms do not have a fully filled 4s orbital?

Chromium and copper

What is the definition of a transition element?

d

Which 2 elements in the d block do not qualify as transition metals and why?

Zinc and scandium. Their ions have full d

What are the 3 properties of transition metals?

Have variable oxidation states, form coloured compounds and can act as catalysts

Why do transition metals form coloured compounds?

White light is absorbed by some wavelengths in the solution of the metal ion

What is a complex?

When one or more molecules (ligands) form coordinate bonds to a central metal atom/ion

What is a ligand?

A molecule or ion which donates a pair of electrons to a central metal ions to form a coordinate bond

What is a dative covalent bond?

The bond between 2 atoms, one of which provides both electrons for the shared pair

What is the coordination number?

Number of coordinate bonds

Give an example of a monodentate ligand?

H2O

Give 2 examples of a bidentate ligand?

Ethandioate ion or NH2CH2ChHNH2 (en)

Give an example of a complex ion with a tetrahedral shape?

CuCl4

Which elements will form complex ions with a square planar shape?

Pt (platinum) and Pd (palladium)

How are cis

trans isomers represented in square planar complexes?

In which kind of molecules does optical isomerism occur in in TM?

Octahedral complexes with 2 or more bidentate ligands

Draw cisplatin

What colour is the aqueous ion of MnO4

What colour is the aqueous ion of Cr2O7 2

What colour is the aqueous ion of Cr(III)

Green

What colour is the aqueous ion of Fe(III)

Yellow

What colour is the aqueous ion of Mn(II)

Pale pink

What colour is the aqueous ion of Fe(II)

Pale green

What colour is the aqueous ion of Cu(II)

Pale blue

What colour is Cu(OH)2?

Blue

What colour is the solution of Cu 2+ with excess ammonia?

Dark blue

What colour is Fe(OH)2?

Green

What colour is Fe(OH)3?

Orange

What colour is Mn(OH)2?

Beige

What colour is Cr(OH)3?

Grey