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# What is Debereiner'S Law of Triads? Explain with the Help of One Example of a Dobereiner'S Triad. - CBSE Class 10 - Science

ConceptEarly Attempts at the Classification of Elements - Dobereiner’s Triads

#### Question

What is Debereiner's law of triads? Explain with the help of one example of a Dobereiner's triad.

#### Solution

According to Dobereiner's law of triads, when elements are arranged in increasing order of their atomic masses, a group of three elements with similar chemical properties is obtained. This group is called a triad. The atomic mass of the middle element is equal to the arithmetic mean of the atomic masses of the other two elements.

For example, the set of elements: calcium (Ca), strontium (Sr) and barium (Ba), with atomic masses 40, 88 and 137 respectively form a triad because they have similar chemical properties, and the atomic mass of  strontium is approximately equal to the average of the atomic masses of calcium and barium.
Arithmetic mean of atomic masses of calcium and barium =(40+137)/2 =88.5

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#### APPEARS IN

Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 5: Periodic Classification Of Elements
Q: 21 | Page no. 283

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Solution What is Debereiner'S Law of Triads? Explain with the Help of One Example of a Dobereiner'S Triad. Concept: Early Attempts at the Classification of Elements - Dobereiner’s Triads.
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