The peroxide ion in sodium peroxide is O22− has total of 18 electrons. Electronic configuration of O22− is σls2,σ*1s2,σ2s2,σ*2s2,π2pz2,π2px2≈π2py2, π*2px2≈π*2py2 Bond order ‌=‌
[10−8]=1 The superoxide in potassium superoxide is O2−has total of 17 electrons. Electronic configuration of O2−is σ1s2,σ×1s2,σ2s2,σ×2s2,π2pz2,π2px2≈π2py2π×2px2≈π×2py1 Bond order =‌