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Which of the following triads is a Dobereiner’s Triad?
  • a)
    N, P, As
  • b)
    S, O, H
  • c)
    Na, Ra, Al
  • d)
    Li, Na, K
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following triads is a Dobereiner’s Triad?a)N, P, As...
DOBEREINER TRIADS RULE :
In 1817, Johann walfgang dobereiner. A German chemist, arranged the elements is group of three elements and in a manner that the atomic mass of middle element was roughly the average of the atomic masses of the other two elements of the triad.
Example:
In the triad of lithium, sodium and potassium. The atomic mass of lithium is 7 and  the atomic mass of potassium is 39. The average of masses of lithium and potassium gives atomic mass of sodium 23. 
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Most Upvoted Answer
Which of the following triads is a Dobereiner’s Triad?a)N, P, As...
Correct option is D because the average of the sum of the atomic mass of Li and K is the atomic mass of Na.Li - 6 u K - 40 uLi + K = 46 u46 u ×1/2 = 23 u that is atomic mass of Na.
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Community Answer
Which of the following triads is a Dobereiner’s Triad?a)N, P, As...
Doberneiner's Law of Triads
When elements with similar properties are taken three at a time and arranged in the ascending order of their atomic weights, the atomic weight of the middle element is the average of the atomic weights of the first and third elements.
Dobereiner’s “triads” (1829): groups of three similar elements: Examples:
  • Li, Na, K
  • Ca, Sr, Ba
  • Cl, Br, I
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Which of the following triads is a Dobereiner’s Triad?a)N, P, Asb)S, O, Hc)Na, Ra, Ald)Li, Na, KCorrect answer is option 'D'. Can you explain this answer?
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