Question

Elements ‘A’ ‘B’ and ‘C’ form a Dobereiner’s triad. If the atomic

mass of element A is 7 and that of element C is 39 find the

atomic mass of element B.​

Answer 1

Answer:

23

Explanation:

7+39/2

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Answer 2

$\huge{\orange{\mid{\boxed{αnѕωєr}\:{\mid}}}}$

A, B and C are the elements of a Dobereiner's triad. If the atomic masses of A and C are 7 and 39 respectively, then according to Dobereiner's triad law, the atomic mass of B is the average of the atomic masses of A and C. Therefore, the atomic mass of B is 23.

$\large{\underbrace{Cᴀʟᴄᴜʟᴀᴛɪᴏɴ-}}$

$\frac{7 + 39}{2} = \frac{46}{2}$

$= 23.$

So, the atomic mass of B is $\huge{\boxed{23}}$.