✔ 最佳答案
As the above said, one Ti atom can covalently bond to 4 Cl atom
But I think the electron diagram should be as follow:
圖片參考:
http://imgcld.yimg.com/8/n/HA00656648/o/701102090147213873378870.jpg
The different is that the diagram also show the valent electrons of the 4 Cl atoms.