CLASS 10 SCIENCE CHAPTER-5 PERIODIC CLASSIFICATION OF ELEMENTS

1. Did Dobereiner’s triads also exist in the columns of Newland’s Octaves? Compare and find out? Solution : Yes, following triads can be identified: Li, Na, K Be, Mg, Ca The atomic mass of middle atom in the above triads is approximately equal to the average mass of elements on the left and right hand side. …

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