, Introduction
• d-block elements
locate between the s-block and p-block
known as transition elements
occur in the fourth and subsequent periods of the Perio
Table
Transition elements are elements that contain an incompl
sub-shell (i.e. d1 to d9) in its ground state or at least one of
oxidation states of their compounds.
It consists of 4 series:
3d, 4d, 5d & 6d(incomplete) series.
, Atomic Electr
Element
number configu
ELECTRONIC Scandium
Titanium
21
22
[Ar] 3d
[Ar] 3d
CONFIGURATION Vanadium 23 [Ar] 3d
Chromium 24 [Ar] 3d
Successive addition of one electron in
penultimate shell {(n-1)d}
Manganese 25 [Ar] 3d
While the electrons in valence shell (ns)
Iron 26 [Ar] 3d
remains the same.
Cobalt 27 [Ar] 3d
Nickel 28 [Ar] 3d
Copper 29 [Ar] 3d
Zinc 30 [Ar] 3d
, Completely filled
orbitals
Zn – [Ar] 3d10 4s2
Cd – [Kr] 4d10 5s2
Hg – [Xe] 4f14 5d10 6s2
General the electronic configuration
(n-1)d1–10 ns1–2.
2+
• d-block elements
locate between the s-block and p-block
known as transition elements
occur in the fourth and subsequent periods of the Perio
Table
Transition elements are elements that contain an incompl
sub-shell (i.e. d1 to d9) in its ground state or at least one of
oxidation states of their compounds.
It consists of 4 series:
3d, 4d, 5d & 6d(incomplete) series.
, Atomic Electr
Element
number configu
ELECTRONIC Scandium
Titanium
21
22
[Ar] 3d
[Ar] 3d
CONFIGURATION Vanadium 23 [Ar] 3d
Chromium 24 [Ar] 3d
Successive addition of one electron in
penultimate shell {(n-1)d}
Manganese 25 [Ar] 3d
While the electrons in valence shell (ns)
Iron 26 [Ar] 3d
remains the same.
Cobalt 27 [Ar] 3d
Nickel 28 [Ar] 3d
Copper 29 [Ar] 3d
Zinc 30 [Ar] 3d
, Completely filled
orbitals
Zn – [Ar] 3d10 4s2
Cd – [Kr] 4d10 5s2
Hg – [Xe] 4f14 5d10 6s2
General the electronic configuration
(n-1)d1–10 ns1–2.
2+
