On the basis of chemical structure which of the following solids will most easily conduct electricity?

caf2

cu

nacl

feo2

Cu

Explanation:

The electrons in copper are delocalized in a "sea of electrons" therefore they move easily between atoms becoming an excellent conductor. One has to remember the valence shell of Copper is 4s1 hence its easy movement.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.