Question

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

Answer 1

Explanation:

(a)normal elements :-

S and P block elements (except noble gases) together are known as normal elements

ex :- group no -> 1,2,13,14,15,16,17 are normal elements

sodium(Na) and boron (B) are example of normal elements

(b) radio active elements are known as harmful elements because the effect the nature.

example->

plutonium(Pu) and rubidium(Rb) are harmful elements

mainly they are present in actinides