Question

can you write set of rational numbers listing elements in it

Answer 1

Hola!

Writing set of All rational numbers is Practically NOT possible.

but,
We can represent set of rational number in set-builder form...

A = { x : x € N , x is a rational number}

Or

A = { 1/2, 3/4, 2/3, 2/1 } 
The elements of set A are 1/2, 3/4, 2/3, 2/1

Hope it helps! :D