Check sibling questions
Class 10
Chapter 5 Class 10 - Periodic Classification of Elements (Term 2)

Assertion (A): In triad, the three elements have same gaps of atomic masses.

Reason (R): Elements in a triad have similar properties.



In the dobereiner's triads, the three elements are grouped together in such a way that the atomic mass of the middle element is the mean of the first and last element.


  • Assertion is false.

Therefore, the correct option is (d) the assertion is wrong

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