Question

What were the two limitations of Mendeleev periodic table overcome by modern periodic table???

Answer 1

beryllium's atomic mass
zero grp element placed at end of table

Answer 2

$\huge{ \underline{\bold {\blue{here \: is \: your \: answer}}}}$

$\huge{ \pink{limitations \: of \: mendeleev \: periodic \: table}}$





¤¤ Position of isotopes could not be explained.

¤¤ He could not identify the position of hydrogen exactly.

¤¤ Wrong order of atomic masses of some elements could not be explained.

E.g.

S Cl Ar K Ca
32 35.5 40 39 40

¤¤ No spaces for Isotopes.

¤¤ Lanthanoids and Actinoids were not given in proper position .

¤¤ Disimilar elements grouped together.

E.g.

Li, Na and K with Cu Ag and Au.