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Questions and Answers
What defines a coordination entity?
What defines a coordination entity?
- A central metal atom or ion bonded to a fixed number of ions or molecules. (correct)
- A group of ions that do not have a central atom.
- A central metal atom or ion surrounded by a variable number of ions or molecules.
- An ionic compound formed between two nonmetals.
Which of the following is an example of a coordination entity?
Which of the following is an example of a coordination entity?
- H2O
- [Ni(CO)4] (correct)
- NaCl
- [Cl2]
What role does the central atom/ion play in a coordination entity?
What role does the central atom/ion play in a coordination entity?
- It is the atom or ion to which fixed numbers of other ions are bound. (correct)
- It serves as a stabilizing agent.
- It primarily exists in a gaseous state.
- It forms covalent bonds only with nonmetals.
Which of the following central atoms/ions is incorrectly matched with its coordination entity?
Which of the following central atoms/ions is incorrectly matched with its coordination entity?
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Which of the following statements about central atoms/ions is true?
Which of the following statements about central atoms/ions is true?
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Study Notes
Coordination Entity
- A central metal atom or ion is bonded to a fixed number of ions or molecules.
- The metal atom or ion is surrounded by the ions or molecules in a specific arrangement.
- Examples include: [CoCl3(NH3)3], [Ni(CO)4], [PtCl2(NH3)2], [Fe(CN)6]4–, [Co(NH3)6]3+
Central Atom/Ion
- The atom/ion in the center of a coordination entity is called the central atom or ion.
- The central atom/ion has a fixed number of ions or groups bound to it in a specific geometric arrangement.
- Examples include: [NiCl2(H2O)4], [CoCl(NH3)5]2+ and [Fe(CN)6]3–
- The central atoms/ions in these examples are Ni2+, Co3+ and Fe3+, respectively.
- Central atoms/ions are also referred to as Lewis acids.
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