It's examples are:
1)London dispersion forces
2)Dipole-Dipole forces
3)Hydrogen bonding...
Because their molecules are more tightly packed. Massdensity = ---------- Volume
So more densely packed molecules means more mass per unit volume. Hence metals are denser than non-metals.
Answer: ok, its C
Explanation: I used D=26.4* 3 to calculat it
