Question

2. What are (a) normal elements, (b) harmful
elements? Give two examples of each.​

Answer 1

Answer:

Normal element :  manganese , potassium

Harmful element  : mercury , polonium

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Answer 2

Answer:

Example: Fluorine (F), Chlorine (Cl), Bromine (Br), etc. Whereas, the elements that give out harmful radiations are called Radioactive Elements. Example: Uranium (U), Thorium (Th), Potassium (K), etc.