Question

17. Study the data of the following three categories A, B and C.
Category Name of the Atomic
element
Mass
Li
23
u
39
14
31
74
10.8
27
Ga
69.7
(i) From the given three categories A, B and C, pick the one which
forms Dobereiner's Triads.
(ii) Why did Mendeleev placed elements of category A, B and C in three
different groups ?
(iii) Is Newland law of octaves applicable to all the three categories ?
Give reason to justify your answer.
P.T.O.​

Answer 1

Answer:

just me is not a bad iiui