Is deuterium toxic or non-toxic?

Yes, Freon is toxic at certain levels. Overexposure causes central nervous system depression and possibly cardiac arrhythmia. Depending on the type of freon, it is also extremely cold and can cause...

Not really. Even water can be dangerous sometimes (in drinking, not drowning).

Non toxic wastes are wastes that do not pose a serious threat to the environment or animals if decomposed carefully. Some of the solid wastes are generated due to domestic activities such as food...

Yes and no. Carbon dioxide is a waste product formed from respiration. It is the build up of this that makes you want to take a breath when you are holding your breath, not the lack of oxygen....

A metal that is not poisonous. Metals that are toxic include elements such as antimoney or copper.