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F block elements
- 1. In the nameof 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
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- 4. Topic : Thef-block elements ii
- 5. What are f-blockWhatare 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-blockClassificationof 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 LanthanumLanthanumLaLa 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 ofElectronicConfiguration 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-blockWhatare 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 afterthefirst element of the series Lanthanum * color: silverwhite * paramagnetic in nature * very high ionization energies and electro negativity
- 11. What are 5f-blockWhatare 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.ModernInorganic 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)
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