Copper crystallizes in a face-centered cubic lattice (the Cu atoms are at the lattice points and at the face centers). If the density of the metal is 8.96 g/cm3, what is the unit cell edge length in pm? × 10 pm

The unit cell edge lenght in pm is equal to 361 pm

Explanation:

Data provided:

ρ=Copper density=8.96 g/cm3

Atomic mass of copper=63.54 g/mol

Atoms/cell=4 atoms (in theory)

Avogadro's number=6.02x atoms/mol

Since copper has a cubic structure, its cell volume is equal to , which can be obtained through the relationship:

cell volume=

Substituting the values:

cell volume=

clearing, we have:

a=

We convert from centimeter to picometer, 1cm=1xpm

a=

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.