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Which one of the following statements is not correct?
1. `Law of triad' was enunciated by Dobereiner
2. Law of octave was presented by Newland
3. The periodic law presented by Mendeleev was based on atomic masses of the elements
4. The attempt for classifying elements by plotting atomic names of elements against the volumes was made by Moseley
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Which one of the following statements is not correct?
