Question

why the metals offers less resistance​

Answer 1

Conductors have number of free electrons in them hence they have low resistance. As number of electrons increases resistance of the matter decreases because number of electrons will decide flow of current or heat through it. More electrons more flow of current.

Answer 2

So the application of electric potential will cause them to move - a current flow. So, metals generally have a relatively low (though not zero) resistance. ... Within a metal conductor, even though there are free electrons, there is still resistance to current flow.