state two merits and two demerits of anomalies of Mendeleev classification of elements
Answers
There were merits as well as demerits of anomalies of Mendeleev's classification of elements.
The merits were as follows ::-
1. systematic arrangements of 66 elements in groups and periods.
2. corrected doubtful masses of some elements like Be,Pd,Pt etc.
3. predicted properties of elements which were not discovered -like scandium , gallium , germanium , which were correct and left gaps for them.
The demerits were as follows ::-
1. controversial position of hydrogen.
2. position of isotopes were not correct.
3. two similar elements like Cu & Hg were grouped differently.
4. Co with higher atomic no. was placed before lower atomic no. Ni which was contradicting arrangement of element in increasing atomic no.
5. did not provide space for noble gases which were discovered later.
6. no space left for isotopes.
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