Metal are good conductors, because

A. They contain free electrons

B. The molecules in them are very close to each other

C. The molecules in them collide very freely

D. They contain reflecting surface

Answer: Option A

Solution(By Examveda Team)

Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.