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CHAPTER 2 : ELEMENTS

An element is a pure substance that cannot be decomposed into any pure substance and which forms basic building blocks of any matter.

2.1 Classification of Elements

Class

Position in periodic table

Properties

Examples

Noble gases

Group 'O'

  • Gases
  • Colorless
  • Chemically Unreactive
  • Diamagnetic (weakly repelled by magnetic field)

Neon

Argon

Krypton

Represe-ntative elements

Group 'A'

  • Metallic or nonmetallic
  • Wide range of chemical behavior
  • Range of physical characteristics
  • Diamagnetic or paramagnetic (drawn in magnetic field)

Nitrogen

Bromine

 

 

Boron

Transition elements

Group 'B'

  • Metallic
  • Paramagnetic
  • Forms highly colored compounds

Titanium

Iron

Zinc

Inner Transition elements

Bottom of periodic table

  • Properties similar to elements of group III B
  • Covered over two periods 6th and 7th
  • 6th period elements are called Lanthanide series
  • 7th period elements are called Actinide Series
  • Metallic
  • In general paramagnetic

Thorium

 

Terbium


Curium

 

Index

2.1 Classification of Elements
2.2 Introduction to the Periodic Table

Chapter 3





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