2. Law of octaves was proposed by
Correct answer: C. J.A.R. Newlands
- A. Lothar Meyer
- B. D.I. Mendeleev
- C. J.A.R. Newlands
- D. J.W. Dobereiner
Explanation
The correct answer is J.A.R. Newlands. He proposed the Law of Octaves in 1864, observing that every eighth element shared similar properties when elements were listed by increasing atomic weight. This was one of the earliest attempts to classify elements systematically. Lothar Meyer and Dmitri Mendeleev both made significant contributions to the development of the periodic table but did not propose the Law of Octaves. J.W. Dobereiner introduced an earlier, different classification method known as triads.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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