metals are also non-biodegradable, then why they are not considered dangerous for our environment ??
Because metals do not cause pollution, they do not produce direct harmful effects to organisms except to the few metals like Hg and Pb.
How does a biodegradable waste differ from a non-biodegradable waste? Give two examples of non-biodegradable wastes which pollute our environment.
If noble gases are neither electropositive nor electronegative in nature, why they are considered as non metals?