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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?
- a)40
- b)15
- c)39
- d)30
Correct answer is option 'C'. Can you explain this answer?
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass ...
's triads.
Dobereiner's triads were a group of elements that were arranged in groups of three, where the middle element had an atomic weight that was approximately the average of the other two elements. These triads were discovered by Johann Wolfgang Dobereiner in the early 1800s and were one of the earliest attempts to classify the elements.
P, Q, R could be any three elements that form a triad in Dobereiner's classification, but here are some examples:
- Lithium (Li), Sodium (Na), and Potassium (K) form a triad where the atomic weight of Na is approximately the average of Li and K.
- Calcium (Ca), Strontium (Sr), and Barium (Ba) form a triad where the atomic weight of Sr is approximately the average of Ca and Ba.
- Chlorine (Cl), Bromine (Br), and Iodine (I) form a triad where the atomic weight of Br is approximately the average of Cl and I.
Dobereiner's triads were a group of elements that were arranged in groups of three, where the middle element had an atomic weight that was approximately the average of the other two elements. These triads were discovered by Johann Wolfgang Dobereiner in the early 1800s and were one of the earliest attempts to classify the elements.
P, Q, R could be any three elements that form a triad in Dobereiner's classification, but here are some examples:
- Lithium (Li), Sodium (Na), and Potassium (K) form a triad where the atomic weight of Na is approximately the average of Li and K.
- Calcium (Ca), Strontium (Sr), and Barium (Ba) form a triad where the atomic weight of Sr is approximately the average of Ca and Ba.
- Chlorine (Cl), Bromine (Br), and Iodine (I) form a triad where the atomic weight of Br is approximately the average of Cl and I.
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass ...
In Dobereiner's traiads , he arranged the elements in the group of three elements in a manner that the atomic mass of middle elements was the average of atomic masses of other two elements of the traids.
let's atomic mass of R be the x.
by traids rules =>( 7+x)/2=23
=> 7+x=23×2
=> x=46-7
=> x=39
hence the atomic mass of R is 39.
let's atomic mass of R be the x.
by traids rules =>( 7+x)/2=23
=> 7+x=23×2
=> x=46-7
=> x=39
hence the atomic mass of R is 39.
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P, Q, R are elements of Dobereiner’s triads. If the atomic mass of P is 7 and that of Q is 23, What will be the atomic mass of R?a)40b)15c)39d)30Correct answer is option 'C'. Can you explain this answer?
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