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Consider the following list of electron ...

Consider the following list of electron configurations:
(1) `1s^(2)2s^(2)3s^(2)` (2) `1s^(2)2s^(2)2p^(6)`
(3) `1s^(2)2s^(2)2p^(6)3s^(1)` (4) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)`
(5) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(6)`
Which one of the above configuration represents a transition element?

A

1

B

5

C

2

D

4

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given electron configurations represents a transition element, we need to understand what transition elements are and where they are located in the periodic table. Transition elements are typically found in the d-block of the periodic table, where the last electron enters a d-subshell. ### Step-by-Step Solution: 1. **Identify the Electron Configurations**: - (1) `1s^(2)2s^(2)3s^(2)` - (2) `1s^(2)2s^(2)2p^(6)` - (3) `1s^(2)2s^(2)2p^(6)3s^(1)` - (4) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)` - (5) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(6)` 2. **Determine the Last Electron's Subshell**: - For (1), the last electron is in the 3s subshell (S-block). - For (2), the last electron is in the 2p subshell (P-block). - For (3), the last electron is in the 3s subshell (S-block). - For (4), the last electron is in the 4s subshell (S-block). - For (5), the last electron is in the 3d subshell (D-block). 3. **Identify Transition Elements**: - Transition elements are defined as those elements whose last electron enters a d-subshell. - From the configurations above, only configuration (5) has its last electron in the 3d subshell. 4. **Conclusion**: - Therefore, the configuration that represents a transition element is **(5) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(6)`**. ### Final Answer: The electron configuration that represents a transition element is **(5)**.
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