In Dobereiner's triad lithium (7), sodium and potassium (39), the approximate atomic mass of sodium is
A. 46
B. 32
C. 23
D. 16
1 answer
Best answer
Answer: C. 23
The middle element's atomic mass is about the mean of the other two: \(\frac{7 + 39}{2} = 23\).
Doubtly AI
· 24 Oct 2026
AI-verified · Oct 2026
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