•This video provides you all types of solved questions on #18electronrule…
•To Find No.Of #Metal-Metal bonds in Complexes…
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The 18-electron rule is a guideline used in chemistry to predict the stability of metal complexes based on the number of electrons in the metal’s valence shell. It is commonly used in organometallic chemistry, where transition metal complexes play a crucial role in catalysis and other important reactions.
According to the 18-electron rule, stable metal complexes typically have 18 valence electrons surrounding the central metal atom. This includes the electrons coming from the metal atom itself, as well as those contributed by ligands that are attached to the metal. The reason behind the 18-electron rule’s effectiveness lies in the fact that having a full d-shell of electrons is energetically favorable for transition metals.
One application of the 18-electron rule is in determining the number of metal-metal bonds in a complex. When a metal complex obeys the 18-electron rule, the number of metal-metal bonds can be calculated by subtracting the number of valence electrons in the complex from 18. For example, if a metal complex has 16 valence electrons, it would have 2 metal-metal bonds. This calculation can be useful in understanding the structure and bonding in transition metal complexes.
Here are some common types of solved questions related to the 18-electron rule:
1. How many metal-metal bonds are present in a complex with 14 valence electrons?
Answer: 4 metal-metal bonds (18 – 14 = 4)
2. If a metal complex has 20 valence electrons, how many metal-metal bonds are present?
Answer: 0 metal-metal bonds (20 – 18 = 2, which is not a valid number of metal-metal bonds)
3. Calculate the number of metal-metal bonds in a complex with 12 valence electrons.
Answer: 6 metal-metal bonds (18 – 12 = 6)
Overall, the 18-electron rule is a useful tool in predicting the stability and structure of metal complexes in chemistry. By understanding this rule and its applications, researchers can gain insight into the behavior of transition metal complexes and their role in various chemical reactions.
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