The variable valency is generally observed in case of
Correct answer: A. Transition elements
- A. Transition elements
- B. Inert gases
- C. Normal elements
- D. Non-metallic elements
Explanation
Transition elements are characterized by their ability to form multiple oxidation states due to the participation of their d-orbitals in bonding. This allows them to exhibit variable valency, unlike main group elements which typically have a single, predictable valency. Inert gases, or noble gases, have stable electronic configurations, leading to a lack of reactivity and a fixed valency of zero. Non-metallic elements, while sometimes having more than one valency, do not exhibit the same range of oxidation states as transition metals.
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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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