The unit cell of and oxide crystal with a cubic lattice parameter of 0.4 nm contains the following atoms with their positioning: B at (0,0,0) A at ( ½ , ½ , ½ ) O at ( ½ , 0,0) O at ( 0, ½ ,0) O at (0, 0, ½ ) i) Sketch the unit cell, including all atoms. ii) What is the chemical formula of the compound. iii) Specify the lattice and basis of this crystal. iv) What are the coordination numbers of A and B.

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.

more infor would

a lot