1.
In the name of Allah , the most
Gracious , the most merciful .

2.
My profile
Name : Muhammad Najiur Rahman
(Ruman)
Home town : Bogra
Present Address : Dhaka ,Mugdapara
School : Khilgaon Govt. High
School , Khilgaon Dhaka
College : Govt. Science College ,
Tejgaon Dhaka

3.
Department of Pharmacy
Now in

4.
Topic : The f-block
elements
ii

5.
What are f-blockWhat are f-block
elements?elements?
The elements in which the extra electron
(also called differentiating electron) enters
(n-2)f orbitals are called f-blockelements.
These elements are also called inner-
transition elements.

6.
Classification of f-blockClassification of f-block
elementselements
Depending on whetherthe extra electron
enters 4f or5f-orbitals, f-blockelements have
been classified into two blocks namely –
a) 4f-blockelements(lanthanides or
lanthanones)
b)5f-blockelements (actinides or
actinones)
These elements are located in group III Band
have been given a separate place at the
periodic table.

7.
Lanthanides
Element
name Symbol Z
LanthanumLanthanum LaLa 5757
CeriumCerium CeCe 5858
PraesodymiumPraesodymium PrPr 5959
NeodymiumNeodymium NdNd 6060
PromethiumPromethium PmPm 6161
SamariumSamarium SmSm 6262
EuropiumEuropium EuEu 6363
GadoliniumGadolinium EuEu 6464
TerbiumTerbium TbTb 6565
DysprosiumDysprosium DyDy 6666
HolmiumHolmium HoHo 6767
ErbiumErbium ErEr 6868
ThuliumThulium TmTm 6969
YtterbiumYtterbium YbYb 7070
LutetiumLutetium LuLu 7171
Element
Name Symbol Z
ActiniumActinium AcAc 8989
ThoriumThorium ThTh 9090
ProtactiniumProtactinium PaPa 9191
UraniumUranium UU 9292
NeptuniumNeptunium NpNp 9393
PlutoniumPlutonium PuPu 9494
AmericiumAmericium AmAm 9595
CuriumCurium CmCm 9696
BerkeliumBerkelium BkBk 9797
CaliforniumCalifornium CfCf 9898
EinsteiniumEinsteinium EsEs 9999
FermiumFermium FmFm 100100
MendeleviumMendelevium MdMd 101101
NobeliumNobelium NoNo 102102
LawrenciumLawrencium LrLr 103103
Actinides

8.
Electronic Configuration ofElectronic Configuration of
f-block elementsf-block elements
The valance shell electronic
configuration of the atoms of these
elements is represented as :
(n-2) f^1….7, 9….14. (n-1)d^0,1 ns^2
4f and 5f corresponding to the filling of
4f and 5f orbitals of 4th
(N-shell, n=4)
and 5th
(O-shell, n=5) shells respectively.

9.
What are 4f-blockWhat are 4f-block
elements?elements?
In the atoms of the 4f blockelements
the extra electron enters 4f-orbitals in
the atoms of the elements of this block
, 4f-orbitals are being progressively
filled. A group of 15 elements from
lanthanum, La(Z=57) to lutetium,
Lu(Z=71) constitute this series. The
lanthanide elements constitute the first
inner-transition series.

10.
Lanthanides
* named afterthe first element of the
series Lanthanum
* color: silverwhite
* paramagnetic in nature
* very high ionization energies and electro
negativity

11.
What are 5f-blockWhat are 5f-block
elements?elements?
In the atoms of the 5f blockelements
the extra electron enters 5f-orbitals in
the atoms of the elements of this block
, 5f-orbitals are being progressively
filled. A group of 15 elements from
actinium, Ac(Z=89) to lawrencium,
Lw(Z=103) constitute this series. The
actinide elements constitute the
second inner-transition series.

12.
ActinidesActinides
* named afteractinium
* radioactive
* highly electro-positive
(show+3,+4,+5,+6 oxidation states)
tarnish in air
* have numberof isotopes
* react with boiling waterordilute acids
to give H2 gas
* directly combine with non-metals

13.
References :References :
1.Modern Inorganic Chemistry- Dr. R.D. Madan
Chap. no. 3 , Page no. 195
Chap. no. 44 , Page no. 1358 (3rd
Revised Edition 2011)
2. Introduction to Modern Inorganic Chemistry-
S.Z. Haider
Chap. no. 4 , Page no. 140 ( Edition 2006-07)
3. Basic Inorganic Chemistry- F.Albert Cotton
Geoffery Wilkinson
Paul L. Gaus
Chap. no. 8 , Page no. 266 (3rd
Edition 2008)

14.
Thank youThank you