GATE XL 2019 XL-P Q14: Atomic Structure and Periodicity

Based on molecular orbital theory, the number of paramagnetic species in the following list

N₂, N₂⁺, N₂²⁻, O₂, O₂⁺, O₂⁻ and O₂²⁻

is ____ (assume that there is no change in energy of the orbitals upon addition/removal of electrons in a molecule)

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