5

Si       0.00000000       0.00000000       0.00000000
Cl      -1.17780000       1.17780000       1.17780000
Cl       1.17780000      -1.17780000       1.17780000
Cl      -1.17780000      -1.17780000      -1.17780000
Cl       1.17780000       1.17780000      -1.17780000