When measuring the volume of water in a graduating cylinder, you measure. A. at the top of the meniscus
B. from the bottom of the meniscus
C. from the exact top of the liquid
D. the average between the volume at the top of and the bottom of the meniscus

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.

the answer is c.the valence of the atoms combine .