The Reactivity of HBr, HI, HF

The reactivity should be HI 勁過HBr勁過HCl勁過HF,
原因:The size of iodide is the largest one. This implies the bond length is longest. The longer the bond length, the weaker the covalent bond, the reactive is the cpd. 個共價鍵長一些會容易一些被拆開,自然是活躍一些的.
由於是along the group 7,Br的原子比Cl的大而Cl的原子 又比F為大,即是bond length of HBr長過HCl,而HCl又長過HF.所以其bond energy是HBr弱過HCl,而HCl又大弱過HF.Hence HBr is more reactive than HCl and HCl is more reactive than HF
In conclusion:The longer the bond length, the weaker the covalent bond, the reactive is the cpd.
cpd = compound.
I hope you understand what I am talking about.

look at bond dissociate enthrapy?! I guess
HF is the most reactive (explosive) then HBr and HI is close to non-reactive.