Question: what are the different types of chemicals?
Answer: Anticholinergic Agents (Anticholinergic Toxidrome) ... 
Biotoxins.
Blister Agents/Vesicants (Irritant/Corrosive - Topical Toxidrome) ... 
Blood/Systemic Agents (Knockdown Toxidrome) ... 
Caustics (Acids) (Irritant/Corrosive - Topical/Inhalation/Ingestion Toxidrome)