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The Periodic Table is arguably the most important concept in chemistry, both in principle and in practice. It is the everyda...

CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES





The Periodic Table is arguably the most important concept in chemistry, both in principle and in practice. It is the everyday support for students, it suggests new avenues of research to professionals, and it provides a succinct organization of the whole of chemistry. It is a remarkable demonstration of the fact that the chemical elements are not a random cluster of entities but instead display trends and lie together in families. An awareness of the Periodic Table is essential to anyone who wishes to disentangle the world and see how it is built up from the fundamental building blocks of the chemistry, the chemical elements.       -- Glenn T. Seaborg



3.1 WHY DO WE NEED TO CLASSIFY ELEMENTS?

3.2 GENESIS OF PERIODIC CLASSIFICATION

3.3 MODERN PERIODIC LAW AND THE PRESENT FORM OF THE PERIODIC TABLE

3.4 NOMENCLATURE OF ELEMENTS WITH ATOMIC NUMBERS > 100

3.5 ELECTRONIC CONFIGURATIONS OF ELEMENTS AND THE PERIODIC TABLE

3.6 ELECTRONIC CONFIGURATIONS AND TYPES OF ELEMENTS: s-, p-, d-, f- BLOCKS

3.6.1 The s-Block Elements
3.6.2 The p-Block Elements
3.6.3 The d-Block Elements (Transition Elements)
3.6.4 The f-Block Elements (Inner-Transition Elements)
3.6.5 Metals, Non-metals and Metalloids

3.7 PERIODIC TRENDS IN PROPERTIES OF ELEMENTS
3.7.1 Trends in Physical Properties
(a) Atomic Radius
(b) Ionic Radius
(c) Ionization Enthalpy
(d) Electron Gain Enthalpy
(e) Electronegativity
3.7.2 Periodic Trends in Chemical Properties
(a) Periodicity of Valence or Oxidation States
(b) Anomalous Properties of Second Period Elements
3.7.3 Periodic Trends and Chemical Reactivity





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