Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Which of the following statement (s) is/are correct?
A. Elements 
form a Dobereiner's Triad.
B. Elements 
form a Dobereiner's Triad.
C. Elements Be, B & S form a Dobereiner's Triad.
D. Elements 
form a Dobereiner's Triad.
Text Solution
Verified by ExpertsThe correct answer is:
A
In Dobereiner's Triad, the atomic weight of the middle element was arithmetic mean of the other two.
Triad:
Element | Atomic weight |
Li | 7 |
Na | 23 |
K | 39 |
Triad:
Element | Atomic weight |
Ca | 40 |
Sr | 88 |
Ba | 137 |
Triad:
Element | Atomic weight |
Cl | 35.5 |
Br | 80 |
I | 127 |
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