In the box below write a short essay about Exothermic and Endothermic Processes using appropriate key terms (REACTIONS and PHASE CHANGES) (it really only needs to be like a 4 sentence paragraph)

the atomic mass is the bottom number on the element.

-steel jelly

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.

it is b that is the answer.