Try pushing the cations so they face each other. This movement is simulating an applied force.
What property of ionic crystals are you modeling when you do this​

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.

i think its 5049.

i hope this !

answerambulatory;

the correct answer would be b) volume versus temperature, because they are also directly proportional.