TS EAMCET · Chemistry · Chemical Bonding and Molecular Structure
Identify all the species that do not exist \[ \mathrm{H}_2^{+}, \mathrm{He}_2^{2+}, \mathrm{Li}_2^{2-}, \mathrm{Ne}_2, \mathrm{Be}_2^{-}, \mathrm{He}_2 \]
- A \(\mathrm{He}_2, \mathrm{Ne}_2\) only
- B \(\mathrm{Li}_2^{2-}, \mathrm{Ne}_2, \mathrm{He}_2\) only
- C \(\mathrm{Be}_2^{-}, \mathrm{He}_2, \mathrm{Ne}_2\) only
- D \(\mathrm{H}_2^{+}, \mathrm{Li}_2^{2-}\) only
Answer & Solution
Correct Answer
(B) \(\mathrm{Li}_2^{2-}, \mathrm{Ne}_2, \mathrm{He}_2\) only
Step-by-step Solution
Detailed explanation
Electronic configuration of \[ \begin{aligned} & \mathrm{Li}_2^{2-}=\sigma 1 \mathrm{~s}^2 \sigma^* 1 \mathrm{~s}^2 \sigma 2 \mathrm{~s}^2 \sigma^* 2 \mathrm{~s}^2 \\ & \Rightarrow \quad \text { B.O. }=0 \end{aligned} \] Electronic configuration of…
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