a) As2O5
O=As-O-As=O
II II
O O
b) SO3
O=S=O
II
O
c) Al2S3
S=Al-S-Al=S
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a) As2O5
O=As-O-As=O
II II
O O
b) SO3
O=S=O
II
O
c) Al2S3
S=Al-S-Al=S