The synonym for poisonous is toxic.
Poisonous, toxic.
Another word for toxicity is poisonous - well actually poisonousness would probably be better but I'm not sure that is even a real word. A more obscure synonym is perniciousness.
Toxic.
energetic, poisonous, dangerous, contaminated
The adjective form of the noun poison is poisonous.The adjectives from the verb to poison are the present and past participle: poisoning and poisoned.
The element is cobalt, named after the German word "kobalt" which means evil spirit. Miners deemed it poisonous due to its toxic properties.
It seems to me that the element called "oxygen" is not named after another element and that the element is most likely named by itself.
Mercury is an element and is very poisonous. It is not used as a drug.
chlorine
no.
Chlorine, which was used as a poisonous gas in World War I.
It was the element Polonium :) does that help?