Question

16. Study the data of the following three categories A, B and C.
Category Name of the element Atomic Mass
Li
7
A
Na
23
K
39
@
B
N.
14
P
31
As
74
B
10.8
AL
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.
3
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Answer 1

Answer:

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