Question

Write the achievement of Mendeleev periodic table?

Answer 1

Answer:

1. For the first time elements were grouped by there similar properties in a well arranged manner

2. He predicted new elements which were not discovered. Ex:- Eka aluminium ( Gallium )

3. Corrected atomic mass of some elements. Ex:- U, Be, In, Au, Pt.

Answer 2

Explanation:

In meedeleev periodic table

arrange the increasing order of their mass .

gallium , Germanium and scandium atomic mass were also discovered before their discovery and name given as aka boron

aka aluminium .aka scandium

mendeleev also created zero group for noble gasses .

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