I have to understand born haber cycle its description and formal charge

And also want to say that not getting satisfaction from this site

The Born Haber cycle for the formation of calcium chloride from its constituent elements involves following steps.

• Atomization enthalpy of calcium: This step involves the conversion of solid calcium to gaseous state.

Ca(s) → Ca(g) ΔHa°(Ca) =178 kj/mol

• Ionization enthalpy of calcium: Calcium forms di-positive ion (Ca2+), therefore the energy involve in the removal of first electron is called as first ionization energy and valued 590 kj/mol. The removal of second electron requires more energy as it’sdifficult to remove electron from a cation. Hence the second ionization energy for calcium ion is 1145 kj/mol.

Ca(g) → Ca+(g) + e-Δ HIE°= 590 kj/mol
Ca+(g) → Ca2+(g) + e- Δ4HIE°= 1145 kj/mol

• Atomization enthalpy of Chlorine: This step involves dissociation of Cl2(g) into Cl(g) atoms. The reaction enthalpy is half of the bond dissociation enthalpy of chlorine. 

½ Cl2(g) → Cl(g) ;Δ Ha°= ½Δ HCl-Cl°=121 kj/mol

• For the formation of calcium chloride, two Cl(g) requires, therefore total atomization enthalpy will be double that is 242 kj/mol.

• Electron affinity of chlorine: This is the amount of energy released during the addition of electron in an isolated neutral gaseous chlorine atom. 

Cl(g) + e- → Cl-(g) ;Δ Hea°= -364 kj/mol 

• Lattice enthalpy: The combination of one Ca2+ ion and two chloride ions (Cl-)to form one mole of calcium chloride release lattice energy (ΔHLE).

Ca2+ (g) + 2Cl-(g) → CaCl2(s)