Question

write the merits and demerits of mendeleev's periodic table ​

Answer 1

Answer:

mendeleev left some spaces in table for upcoming elements and he named three unknown elements as eka boron eka silicon eka aluminium. now it was discovered as gallium scandium germanium respectively

Answer 2

Answer:

Merits

1.It predicted the existence of some elements that had not been discovered at that time.

2.It could predict the properties of several elements on the basis of their positions in periodic table.

3.It could accommodate noble gases when they were discovered.

Demerits

1.The position of isotopes could not b explained.

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

3.A correct position could not b assigned to hydrogen in the periodic table.