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BSCCH- 201 B. Sc. II YEAR INORGANIC CHEMISTRY-II

SCHOOL OF SCIENCES DEPARTMENT OF CHEMISTRY

UTTARAKHAND OPEN UNIVERSITY

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I 1 INORGANIC CHEMISTRY-II BSCCH-201

UTTARAKHAND OPEN UNIVERSITY Page 1

UNIT 1: CHEMISTRY OF THE ELEMENTS OF FIRST TRANSITION (3-d) SERIES CONTENTS:

1.1 Objectives

1.2 Introduction

1.3 Characteristic Properties of d-Block Elements

1.4 Properties of the Elements of the First Transition series

1.5 Binary Compounds and Complexes

1.6 Relative Stability of their Oxidation States

1.7 Coordination number and Geometry

1.8 Summary

1.9 Terminal Questions

1.10 Answers

1.1 OBJECTIVES The objective of writing the text material of this unit is to acquaint the readers to the

characteristic properties of the d-block elements, in general, such as their general electronic configuration and variable oxidation states, complex formation tendency, magnetic properties, formation of coloured ions/compounds, catalytic activity, etc. and periodic properties, viz., atomic radii, atomic volume, ionic radii, melting and boiling points, ionization energies and reactivity, standard electrode potentials and reducing properties, etc. along with their periodic variation along the series. It is also aimed at throwing light on the above properties of the first transition series, in particular, to illustrate the relative stability of the oxidation states of these elements along with to discuss the coordination number and geometry of their complexes and the binary compounds of these elements.

1.2 INTRODUCTION The d-block elements have been defined as "the elements whose atoms

receive the last electron in the d-subshell belonging to the penultimate or (n-1)th shell". The d-block elements are also called the transition elements or metals. This is because they exhibit gradual transitional behaviour between highly reactive s-block INORGANIC CHEMISTRY-II BSCCH-201

UTTARAKHAND OPEN UNIVERSITY Page 2

(electropositive) and p-block (electronegative) elements, i.e. their properties have been found to be intermediate between those of the s-block and p-block elements. Thus these elements are located in the middle of the periodic table and are the members of the Groups 3 to 12 (IIIB to VIII to II B) in the modern periodic table.quotesdbs_dbs3.pdfusesText_6

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