Select Solution in the top-right corner of the screen, and click Remove Solute at the bottom of the screen. Use the faucet at the bottom of the tank to drain the tank completely. Press the red button on the dropper
to fill the tank to the half-liter mark with copper(II) sulfate. Based on the volume and concentration of the
solution, calculate how many moles of copper(ll) sulfate are in the tank.

it's c. elements are placed in rows based on how may valencies electrons have.

a) the particles of the chair are strongly held together.

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.