→ Matter around us is present in the form of elements, compounds and mixtures.
→ Elements are substances containing atoms of only one type. E.g., Na, Mg, Au, etc.
→ There are 118 elements known to us. All these have different properties.
→ To make the study of these elements easy, these elements have been divided into few groups in such a way that elements in the same group have similar properties.
Periodic Classification of Elements |Reduced Syllabus 2021
Periodic classification of elements: Need for classification, early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.
Periodic Classification of Elements |Deleted Syllabus 2021
No Deletion
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