Periodic Table Foundations: Development, Structure, and Periodic Trends

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Periodic Prop erties of Ele m ents 1 FCC0015- Che mistry 1 CHAPTER 4: 2 SCOPE 4.1 The Periodic Table 4.2 Effective Nuclear Charge 4.3 Sizes of Atoms and Ions 4.4 Ionization Energy and Electron Affinity 4.5 Electronegativity 4.5 Metallic Behavior LEARNING OUTCOMES At the end of this lecture, students should be able to:  Identify different group of elements in periodic table.  Relate effective nuclear charge to size of elements and ions.  Explain the general trends and irregularities in ionization energy and electron affinity.  Differentiate between metal, non-metal and metalloid  Understand the general trend in electronegativity and metallic behavior of elements in periodic table 3 4.1 The Periodic Table 4.1.1 Development of Periodic Table • In 1869, the Russian Chemist, Dmitri Mendeleev and the German Chemist, Lothar Meyer independently proposed an extensive tabulation of the elements based on the similarity in properties and reactivities exhibited by certain elements. • The periodic table also have room for additional elements that are yet to be discovered. Number of elements in periodic table that have been discovered is 118 elements up to date • The periodic table arrange e...