How do the energy levels relate to the periods on the periodic table? (Use ONLY lowercase letters. Enter "periods = " (period, space, equal sign, space). Then enter the answer which consists of two words. After the 1st word, enter a space and use the plural form for the 2nd word.) *

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.