disadvantages of mendleev periodic table;1)he had to make disorder inthe arrangementof the elements inascendinng order according to the atomic weight to put them in grouops to suit their properties(chemical or phisical;metal or non-metal,solid or liquid.....)
2)he had to consider isotpes as differ. elements so he had to put them in one cell.
advantages of mosley periodic table,he made modifications to mendleev,s table;1)he added group(0) of inert gases.2)he divided the elements of each group into 2 sub groups(A,B)
he specified a place for (lanthanides ,actinides)