ClO2+

[sonalivij]

Why is the lowest energy resonance structure not one O double bonded to the Cl and one O triple bonded to the Cl, with one lone pair on the Cl, which would give the Cl a formal charge of 0 and the O a formal charge of +1. It's actually both O's double bonded to the Cl, with one lone pair on the Cl, giving the central atom a formal charge of +1 as opposed to a terminal atom.

[Claudia Luong 4K]

This is because you want the positive charge to be on Cl instead of O (due to Cl being less electronegative than O).

[sonalivij]

This is because you want the positive charge to be on Cl instead of O (due to Cl being less electronegative than O).

Isn't Cl more electronegative than O?

[Jocelyne Milke 1G]

O shouldn't have a +1 since it is more electronegative than Cl

[Claudia Luong 4K]

No, if you take a look at the actual electronegativity values, O is more electronegative than Cl.