Question

What are all the achievments of mandaleev periodic table?

Answer 1

1. When new elements were discovered they could be easily accomodated.
2. When noble gases were discovered they could easily be accommodated.
3. systematic study of elements could be done by increasing atomic masses.
4. It could predict the properties of several elements on the basis of their position in table.
5. Correction of some doubtful atomic masses of certain elements was done in this table
example,Be was placed between C and N but because it had properties similar to Mg and Ca it was placed in group 2A
.....hope it helps