On my homework, I came across a reference to a molecule with a formulae of XeF4. Is such a molecule possible? or is my teacher mistaken..
And how is NO2 bonded? Nitrogen has 3 available covalent bonds while Oxygen has 2. Is this case similiar to that of CO where co-ordinate covalencies are involved or what? I've tried drawing diagrams for the bonding structure (without co-ordinate covalent bonds) and still haven't found a possible case where N and O can exist as NO2 (Or NO for that matter)... woe is me.