Question

List any two achievements of Mendeleev periodic table

Answer 1

1) Atomic masses of some elements were revised so as to give them proper place in periodic table.
2)Mendeleev kept vacant places for elements not discovered until now in the periodic table
HOPE THIS ANSWER MAY
BE USEFUL FOR U

Answer 2

his assumption was correct about eka-boron,eka-aluminium,eka-silicon

the inert gas was placed in his table without disturbing his table

hope it was helpful Mark as brainliest