3. Classification of Elements and Periodicity in Properties
Classification of elements provides a systematic approach to studying over 100 elements, grouping similar ones together to facilitate predictions and understanding of their properties. The chapter discusses historical attempts at classification, including Mendeleev's periodic table and the modern periodic law, illustrating trends in properties and the significant differences between metals, non-metals, and metalloids. Understanding these classifications simplifies the study of chemistry and allows for predictions about chemical behavior.
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Sections
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What we have learnt
- Classification helps in studying elements systematically.
- Mendeleev's Periodic Table laid the groundwork for modern classifications.
- The properties of elements are periodic functions of their atomic numbers.
Key Concepts
- -- Periodic Table
- A tabular arrangement of elements based on increasing atomic number, with elements grouped by similar properties.
- -- Periodic Law
- The law stating that the properties of elements are periodic functions of their atomic numbers.
- -- Metals, Nonmetals, Metalloids
- Categories of elements based on their physical and chemical properties, with metals being conductive, non-metals being poor conductors, and metalloids displaying characteristics of both.
- -- Periodicity
- The repeating pattern of properties of elements at regular intervals in the periodic table.
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