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What is the ground-state electron configuration of O2^-? 1. (δ2s)^2(δ2s*)^2(π2p)^3(π2p*)^1 2. (δ2s)^2(δ2s*)^2(δ2p)^2(π2p)^3(π2p*)^2(π2p*)^2 3. (δ2s)^2(δ2s*)^2(δ2p)^2(π2p)^4(π2p*)^1(π2p*)^1 4. (δ2s)^2(δ2s*)^2(δ2p)^2(π2p)^4(π2p*)^2(π2p*)^1 5. (δ2s)^2(δ2s*)^2(π2p)^4(π2p*)^1