Question

List the anomelous of meendaleev periodic with modern periodic table

Answer 1

1 ambiguity regarding cobalt and nickel
2 problem regarding halogen and isotopes

Answer 2

You might as well ask what are the important anomalies of Beethoven’s fifth symphony. The effect of periodicity in electron pattern, a simple elegant pattern of electron harmonics, is constantly modified by electron interactions. So you can learn to explain those, but as far as the table goes, we wouldn't change a tthing.

The interactions include

Orbital shrinkage as the nuclear charge grows

Resistance to shrinkage as shell occupancy increases

Shielding of nuclear charge by inner electrons.

Spin interactions

Relativistic contraction of inner electrons in heavy elements

Thus on the basic rythm of simple electron harmonics, is imposed these interplays that allow the symphony to emerge.