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