Question

3.
Which of the kind of elements give harmful radiation?
1) Metal
2) Non-metal
3) Radioactive element
4) Normal element​

Answer 1

3.)Radioactive element gives harmful radiation.

Answer 2

Radioactive metals which are also called trans-uranic elements give harmful radiation.

They have unstable nucleus. in order to get stability nuclear fission occurs and radiation is released to conserve certain laws of physics...✓✓✓✓