Variable valency is shown by which of the following elements?
Correct answer: B. Co
- A. Na
- B. Co
- C. Mg
- D. Al
Explanation
Cobalt (Co) is known for exhibiting variable valency. It commonly shows valencies of +2 and +3. This ability to exhibit different valencies is due to the involvement of its d-orbital electrons in bonding.Sodium (Na), Magnesium (Mg), and Aluminum (Al) typically exhibit only one valency in their compounds: +1, +2, and +3, respectively.
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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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