Question

two example of normal elements and harmful elements ​

Answer 1

Answer:

▪▪Formed elements----------

a) Outermost shell of these elements is incomplete. The number of electrons in the outermost shell is less than eight.

b) Inner shells are complete

c) s-and p-block elements except inert gases are called normal or representative elements.

eg:hydrogen, oxygen, carbon

Answer 2

Answer:

two normal oxygen & helium

and

harmful RADIUM & URANIUM

I hope u give thanks and liked