Question
Download Solution PDFElements A, B and C occur as Dobereiner’s triads. If the atomic mass of A is 40 and that of C is 137, what will be the atomic mass of B?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF- According to the law of Dobereiner’s triads, the atomic mass of the middle element of the triad is the arithmetic mean of the atomic masses of the other two elements.
- If A, B, and C are elements in Dobereiner’s triads, then the atomic mass of B will be equal to the arithmetic mean of the atomic mass of A and C.
|
Element |
A |
C |
B = (A + C)/2 |
|
Atomic mass |
40 |
137 |
= (40 + 137)/2 ≈ 88 |
|
Atomic Number |
20 |
56 |
38 |
|
Element |
Calcium |
Barium |
Strontium |
Therefore, the atomic mass of element B is 88.
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