periodic table part 1
Periodic table Part.1 (A) Prouts concept Is simply asm.com the elements are made up of hydrogen so we can say that .. Atomic weight of element= n×(Atomic weight.of one hydrogen atom) Where n= no. of hydrogen atom= 123 Drawbacks or limitations: Letter on elements discovered having atomic weight infections like chlorine atomic weight 35.5, Strontium atomic weight 87.5 and proud could not explain why this weights are instructions beasar this is a drawback. (B). Dobereiner trait rule He made groups of three elements having similar chemical properties In Dobereiner trait, atomic weight of middle element is equal to the average atomic weight of first and third element. Eg. Cl Br. I 35.5 80.0. 127 35.5+127/2 = 81.25 (C) Newland law of octaves He arrange the element in increasing order of their atomic mass and observe that properties of every 8th element was similar to the first one like in the case of musical vowe...

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