1.

Explain the achievements (merits) of mendeleev's periodic table​

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Answer:

Achievements of the Mendeleev's PERIODIC tables are as under:-

 As the elements having same properties are GROUPED together so it becomes very useful to remember the properties of large number of elements in a systematic way.

  • 2)  Prediction of new elements:-

 Mendeleev predicted the properties of those missing elements from the KNOWN properties of the other elements in the same group. On the basis of this, he named Gallium as Eka-Aluminum, Germanium as Eka-Silicon and Scandium as Eka-Boron.

  • 3) Correction of atomic mass:-

Atomic mass of beryllium was corrected from 13.5 to 9. Atomic mass of indium, gold and platinum were ALSO corrected.

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