Question

what are the limitations of Deberniner classification and limitation of newlands law of octaves

Answer 1

Limitation of dobereiners triads are :
He couldn't arrange all the elements present at that into triads

Limitations of Newlands law of octaves
1) it was applicable only upto calcium.. After that every eight element did not resemble properties of first one
2) he thought that only 56 elements were there in nature and no elements would be discovered in future. But elements were discovered in future
3) He arranged two elements in the same slot and unlike elements in the same group...

Hope it helps you dear ☺️

Answer 2

debrniner:
could find only 3 traids
total of 9 elements were present ony
he couldn't classify most of the metals 
Newland law of octaves:
The law of octaves was found to be applicable only upto calcium.
 It was not applicable to elements of higher atomic masses
Newlands placed two elements in the same slot to fit elements in the table