In a Dobereiner triad, the atomic mass of the middle element is roughly the:
AAverage of volumes
BAverage of others
CAverage of shells
DAverage of charges
Answer & Solution
Correct answer: B. Average of others
1. The three are written in order of rising atomic mass.
2. The middle one sits halfway between the outer two.
3. So it is the average of the others.
_Source: syllabus Science Class X, Chapter 5, Periodic Classification of Elements._
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