CONTENTS
Foreword iii
Unit 1 Some Basic Concepts of Chemistry 1
1.1 Importance of Chemistry 4
1.2 Nature of Matter 4
1.3 Properties of Matter and their Measurement 6
1.4 Uncertainty in Measurement 10
1.5 Laws of Chemical Combinations 14
1.6 Dalton’s Atomic Theory 16
1.7 Atomic and Molecular Masses 16
1.8 Mole Concept and Molar Masses 18
1.9 Percentage Composition 18
1.10 Stoichiometry and Stoichiometric Calculations 20
Unit 2 Structure of Atom 29
2.1 Discovery of Sub-atomic Particles 30
2.2 Atomic Models 32
2.3 Developments Leading to the Bohr’s Model of Atom 37
2.4 Bohr’s Model for Hydrogen Atom 46
2.5 Towards Quantum Mechanical Model of the Atom 49
2.6 Quantum Mechanical Model of Atom 53
Unit 3 Classification of Elements and Periodicity in Properties 74
3.1 Why do we Need to Classify Elements ? 74
3.2 Genesis of Periodic Classification 75
3.3 Modern Periodic Law and the present form of the Periodic Table 79
3.4 Nomenclature of Elements with Atomic Numbers > 100 79
3.5 Electronic Configurations of Elements and the Periodic Table 82
3.6 Electronic Configurations and Types of Elements: 83
s-, p-, d-, f- Blocks
3.7 Periodic Trends in Properties of Elements
