1.

Achievement of mendeleev periodic table

Answer» 1) He had successfully arranged elements with similar physical and chemical properties under the same group in his periodic table strictly following the principle of periodic recurrence of properties.2) He had made predicted that there are more elements yet to be discovered and also successfully predicted their properties.3) He had even corrected the wrong atomic masses of certain elements.4) Noble gases which were discovered later found a place in his table.
.Mendeleev periodic table araanged in increasing order of atomic masses.It makes easy to study elementHe left some gaps for undiscovered element like Eka boron, eka alumunium eka silicon.
The father of the modern periodic table, left space for undiscovered elements such as germanium and etc. They were referred with "Eka" ex: Eka aluminum


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