The Law of Triad was given by-
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A.
John Newlands
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B.
Henry Moseley
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C.
D.I. Mendeleev
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D.
J.W. Dobereiner
Correct Answer:
D. J.W. Dobereiner
Explanation:
The Law of Triads was proposed by the German chemist Johann Wolfgang Dobereiner in 1817 and further developed by 1829. He observed that certain groups of three elements, which he called triads, shared similar chemical and physical properties. A key feature of this law is that when these elements are arranged by increasing atomic weight, the atomic mass of the middle element is approximately equal to the arithmetic mean of the atomic masses of the first and third elements. For example, in the triad of lithium, sodium, and potassium, the atomic weight of sodium (23) is the average of lithium (7) and potassium (39). This classification was a significant early step toward the development of the modern periodic table.
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