The Chromium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Chromium.
Cr -> Cr+ + e-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Chromium is:
CrN+ -> Cr(N+1)+ + e-
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Cr -> Cr1+ = 652.7 kJ/mol = 156.15 Kcal/mol
\nCr1+ -> Cr2+ = 1592 kJ/mol = 380.86 Kcal/mol
\nCr2+ -> Cr3+ = 2987 kJ/mol = 714.59 Kcal/mol
\nCr3+ -> Cr4+ = 4740 kJ/mol = 1133.97 Kcal/mol
\nCr4+ -> Cr5+ = 6690 kJ/mol = 1600.48 Kcal/mol
\nCr5+ -> Cr6+ = 8738 kJ/mol = 2090.43 Kcal/mol
\nCr6+ -> Cr7+ = 15550 kJ/mol = 3720.10 Kcal/mol
\nCr7+ -> Cr8+ = 17830 kJ/mol = 4265.55 Kcal/mol
\nCr8+ -> Cr9+ = 20220 kJ/mol = 4837.32 Kcal/mol
\nCr9+ -> Cr10+ = 23580 kJ/mol = 5641.15 Kcal/mol
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