revolutionary changes happened to arrange the elements in periodic table
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At first the elements where arranged by doberiner in traides but he arranged only 9 elements.
Then newland arrange elements into octaves but his theory get failed after calcium.
Then mandeleev where sussesfully arranged elements by leaving the gaps for predicted elements but some problems where also in his tables like no position for isotopes and At some locations, elements were put in order of decreasing atomic mass.
For example; Co, Ni and Te, I.
And In 1913, Moseley showed or proved that atomic number is a very important property of a element.
After that, Neil Bohr made the modern periodic table using atomic number.
Then newland arrange elements into octaves but his theory get failed after calcium.
Then mandeleev where sussesfully arranged elements by leaving the gaps for predicted elements but some problems where also in his tables like no position for isotopes and At some locations, elements were put in order of decreasing atomic mass.
For example; Co, Ni and Te, I.
And In 1913, Moseley showed or proved that atomic number is a very important property of a element.
After that, Neil Bohr made the modern periodic table using atomic number.
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