The electronic configuration of four elements are given below. Which element does not belong to the same family as others ?

Options

A. [kr] `4d^(10) 5s^(2)`
B. [Ar] `3d^(10) 4s^(2)`
C. [Ne] `3s^(2)3p^(5)`
D. [Xe] `4f^(17) 5d^(10) 6s^(2)`

Answer

To determine which element does not belong to the same family as the others based on their electronic configurations, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Electronic Configurations**:
Let's denote the electronic configurations of the four elements as follows:
- Element A: [Kr] 5s² 4d¹⁰
- Element B: [Kr] 5s² 4d⁹
- Element C: [Kr] 5s² 4d⁸
- Element D: [Ne] 3s² 3p⁵

2. **Determine the Valence Electrons**:
- For Elements A, B, and C, the outermost configuration is 5s² 4d⁸/⁹/¹⁰, indicating they have 2 electrons in the s subshell and varying numbers in the d subshell.
- For Element D, the outermost configuration is 3s² 3p⁵, which indicates it has 7 valence electrons (2 from s and 5 from p).

3. **Identify the Groups**:
- Elements A, B, and C belong to Group 12 of the periodic table (transition metals), as they have similar outermost configurations.
- Element D, with its configuration of 3s² 3p⁵, belongs to Group 17 (the halogens).

4. **Conclusion**:
Since Elements A, B, and C belong to the same group (Group 12) and have similar outermost electronic configurations, while Element D belongs to a different group (Group 17), we can conclude that Element D does not belong to the same family as the others.

### Final Answer:
Element D (with the electronic configuration [Ne] 3s² 3p⁵) does not belong to the same family as the others.

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