Which has largest size peroxide or superoside?
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Larger cations are stabilized by larger anions due to higher lattice energies.The anion sizes in increasing order are oxide < peroxide < superoxide, so lithium forms the most stable ...
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As the size of alkali metal ion increases the stability of peroxides and super oxides increases. This is due to the stabilization of larger anions by larger cations.
As we move from Li+ to Cs+ the size of the cations increases.
Li+ is the smallest cation with strong positive field around it. Hence it combines with small anion called oxide ion (O-2) with strong negative field and form Lithium oxide.
Na+ ion is bigger than Li+ ion with less positive field around it combines with peroxide ion (O2-2) with less negative field and form sodium peroxide.
K+, Rb+ and Cs+ ions are bigger in size with less positive field around them. Hence they can stabilize the bigger superoxide ion (O2-) with less negative field and form super oxides.
As the size of alkali metal ion increases the stability of peroxides and super oxides increases. This is due to the stabilization of larger anions by larger cations.
As we move from Li+ to Cs+ the size of the cations increases.
Li+ is the smallest cation with strong positive field around it. Hence it combines with small anion called oxide ion (O-2) with strong negative field and form Lithium oxide.
Na+ ion is bigger than Li+ ion with less positive field around it combines with peroxide ion (O2-2) with less negative field and form sodium peroxide.
K+, Rb+ and Cs+ ions are bigger in size with less positive field around them. Hence they can stabilize the bigger superoxide ion (O2-) with less negative field and form super oxides.
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