1. The problem statement, all variables and given/known data Assuming 2s-2p mixing is not operative, the paramagnetic species among the following is 1. Be2 2. B2 3. C2 4. N2 2. Relevant equations NA 3. The attempt at a solution Not able to understand the statement "2s -2p mixing is not operative". Can you help? Paramagnetism is a specie having unpaired electron. How to relate it here?