The standard metric unit of time is the

The standard metric unit of time is the second.

Explanation:

Mass:Kilogramkg

Temperature:KelvinK

Time: Seconds

Amount of Substance:Molemol

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