Study the data of the following three categories A, B and C.
Category Name of the element Atomic Mass
A LiNaK 72339
B NPAs 143174
C BAlGa 10.82769.7
(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 a reason to justify your answer.

Category	Name of the element	Atomic Mass
A	LiNaK	72339
B	NPAs	143174
C	BAlGa	10.82769.7

(i) From the given three categories A, B, and C, Category A contains Dobereiner's Triads.

(ii) Mendeleev placed elements of categories A, B, and C in three different groups because they all have different atomic masses.

(iii) Newland's law of octaves is applicable only up to Calcium. Hence, it is applied to all three categories given.

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Updated on: 10-Oct-2022

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