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Periodic Classification of Elements Class 10 Science SSC Dobereiner’s Triads
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Periodic Classification of Elements Class 10 Science SSC - Dobereiner’s Triads • Access full course Online on https://learnfatafat.com/courses/mh-s... • Topics covered in this 10th Science video are as follows : • Dobereiner's Triads • Dobereiner arranged the elements in increasing order of atomic masses. • Dobereiner observed that, when the elements in the triads are arranged in increasing order of atomic masses then the mass of the middle element was average of atomic masses of other two elements. Such triads are called Dobereiner’s Triads. • E.g. Consider the triad Lithium, Sodium, and Potassium having atomic masses 6.9, 23, 39 respectively if we take average of atomic masses of Lithium and Potassium then it comes out to be 22.95 which is nearly the atomic mass of Sodium. • Demerits of Dobereiner’s Classification • The Dobereiner’s triads were applicable to only few triads of elements.Hence with this classification other elements could not be classified.
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