both lif and nacl has rock salt structure, describe this type of crystal structure, plot the unite cell of this structure, name some compounds that have similar crystal structure.

Nickel has an fcc crystal structure. If the Ni atoms at the center of the faces of the cubic cell are substituted by Al atoms, an ordered alloy is obtained. Determine the composition of the alloy (how many Al atoms per Ni atom), and its new crystal structure and basis.

22) In order to study the structure of a crystalline solid, youwant to illuminate it with EM radiation whose wavelength is thesame as the spacing of the atoms in the crystal (0.20 nm).

a) What is the frequency of the EM radiation ?

b) In what part of the EM spectrum (radio, visible, etc.) does itlie ?

Describe similarities and differences between the Bohr model and the quantum mechanical model of atomic structure?