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9 years ago. However, the fourth valence electron on "Cl" contracts the bond angle relative to "ClO"_2 even more than if there were only three nonbonding valence electrons on "Cl". Bond angles are as follows: ClO 2- : 110 o. Cl 2 O: 110.88 o. ClO 2 : 117.40 o. ClO − 2 has 7 + 6 + 6 + 1 = 20 total valence electrons to distribute. What is the bond angle of ClO2- ion? Chlorine dioxide has two resonance structures with a double bond on one side and a single bond and three electrons on the other. ClO2 has 7 + 6 + 6 = 19 total valence electrons. kentchemistry.com. The ideal bond angle is 109.5o. Relevance. This is because of two groups of bonding electrons and two lone pairs of electrons. ClO 2 has 7 + 6 + 6 = 19 total valence electrons to distribute. Bond angle of ClO2-Bond angle of ClO2- In doing so, the electron pair geometry of the molecule is tetrahedral and the molecular geometry is bent. Find the hybridization as well identify the pπ-pπ as well as pπ-dπ bonds in $\ce{ClO2}$. 1 Answer. Thus electron density is concentrated in F & Cl leading to high inter electronic repulsion predominance. As per the structures : In both cases F & Cl are more electronegative than the N & P respectively. Chlorine dioxide is prepared in a laboratory by the oxidation of sodium chlorite, or NaClO2. It results from its tetrahedral electron pair shape. $\ce{ClO2}$ has 2 $\sigma$ bonds, 1 lone pair, 2π bonds … Since there are two lone pairs on chlorine, the electron pair repulsion will result in a bond angle that is slightly less than 109.5. The bond angle of a chlorite ion or ClO2- ion is 109.5 and has a bent shape. ClO2- has 7+6+6+1=20 total valence electrons to distribute. Bond Parameters - Bond Length, Bond Angle, Bond Enthalpy, Bond Order The bond angle also changes to <109.5o. Another example of a molecule that has a bent molecular geometry is water. Lv 7. I cannot find a more precise actual bond angle … Favorite Answer. Does this make sense? Is it different than OF2? I thought that ClO2- would be 109.5 and OF2 would be 104.5. The bond order of each Cl−O bond in the resonance hybrid structure is lower than the bond order in each Cl=O bond in ClO2 The increasing order of bond angle is as follows: ClO 2- Cl 2 O ClO 2. Thus, the molecule ClO2− has tetrahedral (4) electron-group arrangement around the central Cl atom. Answer Save. The correct order of increasing bond angles in the following species is (a) Cl2O < ClO2 < ClO2- But it makes sense that 1.5 LPs will compress the bond angle less effectively than two, so ClO2 should have the wider angle. Both resonance structures have a bent molecular geometry with an O=Cl-O bond angle of 117.6 degrees. Due to the presence of two lone pair of electrons, the geometry of the molecule changes from tetrahedral to V-shape or bent. How much smaller of a bond angle we get, I'm not sure. 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