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  • Which among the following electronic configurations belongho main group elements?

Q.84) Which among the following electronic configurations belongho main group elements?

A. $[\mathrm{Ne}] 3 \mathrm{~s}^1$

B. $\quad[A r] 3 d^3 4 s^2$

C. $\left.[\mathrm{Kr}] 4 \mathrm{~d}^{16} 5 s^2 5 \mathrm{p}\right]^{40}$

D. $[A r] 3 d^{10} 4 s^1$

E. $[R n] 5 r^0 6 d^2 7 s^2$

Choose the correch answer from the option given below :

A) A, C and D only

B) B and E only

C) A and C only

D) D and E only

 

Answers (1)

best_answer

Q.84) A. [Ne] $3 s^1$
- This is s-block, Group 1 (like Na )
- $\vee$ Main group
B. [Ar] $3 d^3 4 s^2$
- Has electrons in the d-orbital $\rightarrow \mathrm{d}$-block
- Likely a transition metal (e.g., Vanadium)
- $\times$ Not main group
C. $\left[K_r\right] 4 d^{10} 5 s^2 5 p^5$
- Valence shell: $5 s^2 5 p^5$
- Group 17 (Halogens)
- $\quad$ Main group
D. $[A r] 3 d^{10} 4 s^1$
- Looks like $\mathrm{Cu}(\mathrm{Z}=29)$
- Has filled d-orbitals $\rightarrow$ transition metal
- $\times$ Not main group
E. $[R n] 5 f^0 6 d^2 7 s^2$
- Contains 6d electrons, possibly actinide or early d-block
- Example: Thorium (Z = 90)
- $\times$ Not main group

Hence, the correct answer is option (3).

 

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