Chemical Properties can vary between chemicals, and there are a few major types of safety protocols, such as WHMIS.
Some chemicals can either be poisonous or even dangerous, and cyanide is a notable example of a poisonous substance. These substances can make you incredibly ill.
Toxic and poisonous chemicals are controlled by federal law, one example is asbestos, which was banned for being too poisonous for humans
Asbestos is an example of a carcinogen, as exposure to it can cause mesothelioma
Oxidation state can occur through nature, and it varies between materials, and atoms.