In the Mendeleev's periodic table, elements are arranged in the increasing order of their
Correct answer: C. Atomic weight
- A. Numbers of neutrons
- B. Atomic number
- C. Atomic weight
- D. Atomic volume.
Explanation
Mendeleev's periodic table organized elements based on increasing atomic weight, as the concept of atomic number was not yet established. At the time, atomic weight was the most reliable property to correlate with the chemical properties of elements. Option A, 'Numbers of neutrons', is incorrect because neutrons were not discovered until after the development of Mendeleev's table. Option B, 'Atomic number', is incorrect because the atomic number concept was not used in Mendeleev's time. Option D, 'Atomic volume', is also incorrect; while it is a property that can reflect periodic trends, it was not used by Mendeleev for the primary arrangement of elements.
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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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