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If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is:
- a)arsenic
- b)sulphur
- c)iodine
- d)calcium
Correct answer is option 'A'. Can you explain this answer?
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If the two members of a Dobereiner triad are phosphorus and antimony, ...
According to Dobereiner, the atomic mass of the middle element was nearly equal to the arithmetic mean of the other two.Therefore,the atomic mass of the third element is 
which is nearly equal to the atomic mass of arsenic.
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which is nearly equal to the atomic mass of arsenic.Most Upvoted Answer
If the two members of a Dobereiner triad are phosphorus and antimony, ...
Dobereiner's Triads:
Dobereiner's triads are groups of three elements that have similar chemical properties and occur at regular intervals when arranged in order of increasing atomic masses. Each triad consists of three elements, where the atomic mass of the middle element is approximately the average of the other two.
Given Information:
- The two members of the Dobereiner triad are phosphorus and antimony.
Explanation:
To determine the third member of the triad, we need to find an element with a similar atomic mass to the average of phosphorus and antimony. Let's calculate the average atomic mass of phosphorus and antimony.
Atomic mass of phosphorus (P) = 31
Atomic mass of antimony (Sb) = 122
Average atomic mass = (31 + 122) / 2 = 76.5
Options:
a) arsenic
b) sulphur
c) iodine
d) calcium
Comparison:
- The atomic mass of arsenic (As) is 74.92, which is closest to the average atomic mass of 76.5. Therefore, option 'A' (arsenic) is the correct answer.
- The atomic mass of sulphur (S) is 32.07, which is significantly lower than the average atomic mass.
- The atomic mass of iodine (I) is 126.9, which is significantly higher than the average atomic mass.
- The atomic mass of calcium (Ca) is 40.08, which is significantly lower than the average atomic mass.
Conclusion:
Based on the comparison, the third member of the Dobereiner triad with phosphorus and antimony is arsenic (As).
Dobereiner's triads are groups of three elements that have similar chemical properties and occur at regular intervals when arranged in order of increasing atomic masses. Each triad consists of three elements, where the atomic mass of the middle element is approximately the average of the other two.
Given Information:
- The two members of the Dobereiner triad are phosphorus and antimony.
Explanation:
To determine the third member of the triad, we need to find an element with a similar atomic mass to the average of phosphorus and antimony. Let's calculate the average atomic mass of phosphorus and antimony.
Atomic mass of phosphorus (P) = 31
Atomic mass of antimony (Sb) = 122
Average atomic mass = (31 + 122) / 2 = 76.5
Options:
a) arsenic
b) sulphur
c) iodine
d) calcium
Comparison:
- The atomic mass of arsenic (As) is 74.92, which is closest to the average atomic mass of 76.5. Therefore, option 'A' (arsenic) is the correct answer.
- The atomic mass of sulphur (S) is 32.07, which is significantly lower than the average atomic mass.
- The atomic mass of iodine (I) is 126.9, which is significantly higher than the average atomic mass.
- The atomic mass of calcium (Ca) is 40.08, which is significantly lower than the average atomic mass.
Conclusion:
Based on the comparison, the third member of the Dobereiner triad with phosphorus and antimony is arsenic (As).
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If the two members of a Dobereiner triad are phosphorus and antimony, ...
According to Dobereiner, the atomic mass of the middle element was nearly equal to the arithmetic mean of the other two.Therefore,the atomic mass of the third element is 
which is nearly equal to the atomic mass of arsenic.
which is nearly equal to the atomic mass of arsenic.Attention Class 10 Students!
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If the two members of a Dobereiner triad are phosphorus and antimony, the third member of this triad is:a)arsenicb)sulphurc)iodined)calciumCorrect answer is option 'A'. Can you explain this answer?
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