CBSE Class 10 Science 2020 Outside Delhi Set 1

Question : 17 of 30

Marks: +1, -0

Study the data of the following three categories A, B and C.

Category	Name of the element	Atomic Mass
A	${\Li}$ ${\Na}$ $\K$	$7$ $23$ $39$
B	${\N}$ ${\P}$ $\As$	$14$ $31$ $74$
C	$\B$ $\Al$ $\Ga$	$10.8$ $27$ $69.7$

(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.

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