Question

what are the achievements of mendeleev's periodic table?

Answer 1

1) he arrange all the elements know at that time.
2) he left some space in her table because he suggested some elements are not discovered till.
3 he arrange periodic table by reaction with hydrogen and oxygen ...

Answer 2

________Answer_______

Mendeleev's Periodic Table :-

=>The physical and chemical properties of elements are periodic function of their atomic mass .

✒Achievements :-

• In order to adjust elements in his periodic table the sequence was inverted in which elements with slightly greater atomic mass were placed before the element with Lower atomic mass.

• for example:- Cobalt (Co) with atomic mass 58.93 and Nickel (Ni) with 58.71

• He left some gaps from the Undiscovered periodic table . He predicted the existence of some element that had not been discovered.

• He named them by prefixing Sanskrit numeral Eka(one) to the name of preceding element in the same group.

• for example:- Scandium,Gallium, Germanium discovered later has properties to Eka- Boron( Scandium) , Eka - aluminium (Gallium) , Eka -silicon (Germanium)

• Noble gases which were discovered later could be placed in new group without disturbing the existing order.

__________Thank you ☺