Chemistry · Periodic Classification of Elements
Which of the following statements regarding Dobereiner's triads is NOT correct?
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- 1If three elements are arranged in the increasing sequence of atomic masses, then atomic mass of the middle element is approximately the average of the atomic masses of the other two elements.
- 2Li, Na and K constitute Dobereiner's triads.
- 3Cl, Br and I constitute Dobereiner's triads.
- 4If three elements are arranged in the decreasing sequence of atomic masses, then atomic mass of the third element is approximately the average of the atomic masses of the other two elements.✓
Correct answer
If three elements are arranged in the decreasing sequence of atomic masses, then atomic mass of the third element is approximately the average of the atomic masses of the other two elements.
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