h , k , l= Miller Indices ;
U=Lattice Energy ; NA= Avogadro Number ; M= Madelung Constant ; z+ & z- = Charge on the Cation & the Anion;
e = Change of an electron; n= Born Exponent ; r =Inter ionicDistance; εo = Permitivity of free Space;
n = An integer ; λ = Wavelength of the incident light ; dhkl= Lattice Spacing ; θ = Angle of incidence ;
dhkl= Lattice Spacing ; a = Lattice Constant ; h , k , l = Miller Indices;
d= Interplanar Spacing ; h , k , l = Miller Indices; a ,c = Lattice Constants
t1/2 = Half-life of the isotope; T = Time taken for the specific decay ; Wini = Initial amount of the radioactive isotope; Wfin = Final amount of the radioactive isotope
t1/2 = Half Life of Radioactive elment; λ = Decay Constant of the radioactive element
λ = Radioactive Decay Constant or Disintegration Constant; t = Time interval for which radioelement is present ;
n0 = Initial number of atoms ; n= Final number of atoms.
Z = Effective nuclear charge; Z = Atomic Number ; σ = Shielding