During change of N2 to N2- ion, the added electron goes to
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Hence, this electrons goes to antibonding π molecular orbital.
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During the change of N2 to N2-, the added electron goes to (π*2px) molecular orbital.
In N2- we have 15 electrons and there are 10 bonding electrons and 5 anti-bonding electrons. In N2- we have one unpaired electron so it also shows some magnetic moment.
The bond order of N2- is 2.5 while the bond order for N2 is 3. As bond order is inversely proportional to bond strength the bonds formed by N2- will be weaker as compared to N2. the bond length of N2- will be more.
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