Question:
Which of the following species is paramagnetic?
Which of the following species is paramagnetic?
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A species is paramagnetic only if its molecular orbital configuration has an unpaired electron.
Updated On: Nov 12, 2026
- \(\text{N}_{2}\)
- \(\text{Li}_{2}\)
- \(\text{F}_{2}\)
- \(\text{N}_{2}^{+}\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Paramagnetism needs at least one unpaired electron in the molecular orbital configuration.
Step 2: Check each species
\(\text{Li}_2\) (6 electrons), \(\text{N}_2\) (14 electrons) and \(\text{F}_2\) (18 electrons) have all electrons paired, so they are diamagnetic.
Step 3: The cation
\(\text{N}_2^{+}\) has 13 electrons. Removing one electron from \(\sigma 2p_z\) of \(\text{N}_2\) leaves one unpaired electron, so it is paramagnetic.
Final Answer:
N2+ is the paramagnetic species. \[ \boxed{\text{(D) }\text{N}_{2}^{+}} \]
Paramagnetism needs at least one unpaired electron in the molecular orbital configuration.
Step 2: Check each species
\(\text{Li}_2\) (6 electrons), \(\text{N}_2\) (14 electrons) and \(\text{F}_2\) (18 electrons) have all electrons paired, so they are diamagnetic.
Step 3: The cation
\(\text{N}_2^{+}\) has 13 electrons. Removing one electron from \(\sigma 2p_z\) of \(\text{N}_2\) leaves one unpaired electron, so it is paramagnetic.
Final Answer:
N2+ is the paramagnetic species. \[ \boxed{\text{(D) }\text{N}_{2}^{+}} \]
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