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The three elements A, B and C with simil...

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. This mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as ? Give on example of such a set of elements.

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The arrangement is known as Dobereiner's triad. For example. Calcium (Ca), Strontium (Sr) and Barium (Ba). For more details, consult section 5.2.
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The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.

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Knowledge Check

  • Three elements X , Y and Z have atomic numbers 19 , 37 and 55 respectively . Then the correct statements (s) is / are

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    Their ionisation potential would increase with increasing atomic numbers
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    D
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