✔ 最佳答案
As2O3 does not exist as a molecule, but as a bigger molecule of As4O6
http://cerhr.niehs.nih.gov/chemicals/arcenic/1327-53-3.gif
as As is in the same group of Nitrogen, i will form 3 bonds to three Oxygen sharing one electron to each oxygen, forming a single bond
this structure is a giant covalent structure.