Two beakers in a laboratory are full of white crystals. One beaker contains sodium chloride, and the
other beaker contains sucrose. The labels have come off
the beakers, however, so you are not sure which is
which. A chemistry handbook lists the solubility of
sodium chloride in water as 36 g/100 mL at 25°C and
the solubility of sucrose in water as 200 g/100 mL at
25°C. Write a procedure that describes how to safely
identify the two chemicals.

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 .