Question

Answer pls...

What r de achievements of Modern Periodic Table????

Answer 1

achievement of modern periodic table..- :
1. it defined the position of isotopes..
2. it defined the position of hydrogen.
3. it corrected the wrong order of atomic masses in the mandelive periodic table...
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Answer 2

Position of hydrogen was explained
Elements were placed according to atomic no
Properties of elements were a period function of their atomic number
Isotopes of elements were explained

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