why is copper cadium unfriendly to theenvironment?

Question

what are the list of unfriendly materials and chemicals to the environment?

Answer 1

everything you ever wanted to know about Cadmium...and more here. Pg. six summarizes the toxicity issue

http://www.nature.nps.gov/hazardssafety/toxic/cadmium.pdf

plenty more info on other toxic materials here:

http://www.nature.nps.gov/hazardssafety/toxic/list.cfm

enjoy.

Answer 2

Copper will normally corrode very little ,but if it is connected to some other metals it will eat up very quickly. So cadmium is placed between copper and the other metals to stop corrosion.