Suppose Zn metal is completely consumed in an HCl solution to produce zinc (II) choride (ZnCl2) and hydrogen gas (H2) according to the following reaction: Zn + 2HCl > ZnCl2 + H2
How many moles of ZnCl2 are produced if you start with 7.32 moles of HCl?

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

you need to have a picture of the atom that way we can answer it