what are the advantages and disadvantages of mendeleev's periodic table
Answers
Answer:
Advantages-It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table. It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.
Disadvantages-1.Position of hydrogen:- hydrogen resembles both, alkali metals and the halogens in properties so Mendeleev could not decide where to place it
2. Position of Isotopes:- As atomic weight of Isotopes differ, they should have been placed in different position in Mendeleev's periodic table.
advantages:-
Mendeleev’s periodic table is, more accepted for its originality and boldness in making corrections in the properties and predicting unknown elements.
Mendeleev was the first one to establish a systematic arrangement and bring out the periodicity of properties of elements with atomic weight and propose a periodic law.
It could point out the incorrect atomic weight of some elements known at that time.
It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table.
It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.
disadvantages:-
He was unable to locate hydrogen in the periodic table.
Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.
Later on, isotopes of elements were found which violated Mendeleev’s periodic law.