[Joe555]

Why is C-Cl dipole more polar than C-Br? Is that an error with my revision guide? Because as i see it....Bromine is the larger atom, more electrons etc so surely it would be more electronegative creating a stronger dipole? Anyway any help would be greatly appreciated! Cheers

[thelostchild]

Electronegativity is the ability to attract electrons towards the element (essentially). Therefore bromine will be less electronegative than chlorine as it has more electrons spread out which shield the +vely charged nucleus from attracting other electrons.

[Cutie Xx]

If you look at the electronegativity table, itl show u that there is more of a difference in the values of C and CL than between C and Br. x x

[badeninc]

Yes thats right if you look its going across and up that increases the electronegativity
N O F Cl Br

[Strangey]

Everyone's answers are correct; the bond is weaker, as there is electron shielding. You are probaly thinkning of Van der Waals/London forces. These will be stronger in the lower elements, as they have more electrons to form induced/instantanious bonds with.

[Carlo08]

F.o.n.cl.br.i

They are the most electroneg elements in order, also when Flourine bonds to something the bond produced is ionic due to the high electronegitivity and the electrons are attracted over the the F producing an ionic bond.