1. Xhx is ced's very close friend in ASU, so he was so excited for this=.=..Maybe because of fate.
2. For one comment of my photo by ced, I added xhx as a friend in xiaonei. Then I found xhx is from Dongying too, and we are both Scorpio...
3. In chapter 8, the Barriers of XHX vs HXH (X=F, Cl, Br) are studied with VB approach. We find the difference between two series. For F atom, the contributions of ionic structures dominate the difference of barriers. While for Cl and Br atom, repulsion and resonance play important roles for the reactions.