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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
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Class
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Position in periodic table |
Properties |
Examples |
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Noble gases |
Group 'O' |
- Gases
- Colorless
- Chemically Unreactive
- Diamagnetic (weakly repelled by magnetic field)
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Neon
Argon
Krypton |
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Represe-ntative elements |
Group 'A' |
- Metallic or nonmetallic
- Wide range of chemical behavior
- Range of physical characteristics
- Diamagnetic or paramagnetic (drawn in magnetic field)
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Nitrogen
Bromine
Boron
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Transition elements |
Group 'B' |
- Metallic
- Paramagnetic
- Forms highly colored compounds
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Titanium
Iron
Zinc
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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
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Thorium
Terbium
Curium |
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Index
2.1 Classification of Elements
2.2 Introduction to the Periodic Table
Chapter 3
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