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Element with pseudooctet configuration i...

Element with pseudooctet configuration in its outermost shell

A

Copper

B

Palladium

C

Gold

D

Platinum

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The correct Answer is:
To determine which element has a pseudooctet configuration in its outermost shell, we need to understand what a pseudooctet configuration is. A pseudooctet configuration is characterized by having a total of 18 electrons in the outermost shell, which includes the full s, p, and d subshells (i.e., S2, P6, and D10). ### Step-by-Step Solution: 1. **Understanding Pseudooctet Configuration**: - A pseudooctet configuration consists of 18 electrons in the outermost shell, represented as S2, P6, and D10. 2. **Identify the Electronic Configurations of the Given Elements**: - We will write the electronic configurations for the elements in question: - **Copper (Cu)**: - Electronic configuration: [Ar] 3d10 4s1 - **Palladium (Pd)**: - Electronic configuration: [Kr] 4d10 - **Gold (Au)**: - Electronic configuration: [Xe] 4f14 5d10 6s1 - **Platinum (Pt)**: - Electronic configuration: [Xe] 4f14 5d9 6s1 3. **Analyze Each Configuration**: - **Copper**: Has 11 electrons in the outermost shell (4s1 + 3d10 = 11). - **Palladium**: Has 10 electrons in the outermost shell (4d10 = 10). - **Gold**: Has 11 electrons in the outermost shell (6s1 + 4f14 + 5d10 = 11). - **Platinum**: Has 10 electrons in the outermost shell (6s1 + 4f14 + 5d9 = 10). 4. **Determine Which Element Fits the Pseudooctet Configuration**: - None of the elements listed has a complete S2, P6, and D10 configuration in their outermost shell. However, we need to check for the presence of 18 electrons in the outermost shell. - **Palladium** is the only element that has a complete d subshell (4d10) and does not have any s or p electrons in the outermost shell, making it the closest to a pseudooctet configuration. 5. **Conclusion**: - The element with a pseudooctet configuration in its outermost shell is **Palladium (Pd)**.
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