Which of the following ions form the most stable complex compounds.
Correct answer: A. Cu+2
- A. Cu+2
- B. Ni+2
- C. Fe+2
- D. Mn+2
Explanation
Charge on the central metal ion: In general, the greater the charge density on the central ion, the greater the stability of its complexes. The greater the charge and the smaller the size of an ion, i.e., (the larger the charge/radius ratio of an ion), the greater the stability of its complex.Cu++ ions form the most stable complex compound due to higher charge density. As the charge on all given ions is the same so size factor determines the overall stability of complexes. The size of copper is the least among the given ions. There is a direct relationship between the charge density of metal ions and the stability of the complex.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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