The Yttrium Ionization Energy is the energy required to remove from atom one mole of electrons with subsequent production of positively charged ion of Yttrium.
Y -> Y+ + e-
This process can be repeated many times, but the energy cost is increased dramatically. The general equation for the Yttrium is:
YN+ -> Y(N+1)+ + e-
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Y -> Y1+ = 616 kJ/mol = 147.37 Kcal/mol
Y1+ -> Y2+ = 1181 kJ/mol = 282.54 Kcal/mol
Y2+ -> Y3+ = 1980 kJ/mol = 473.68 Kcal/mol
Y3+ -> Y4+ = 5963 kJ/mol = 1426.56 Kcal/mol
Y4+ -> Y5+ = 7430 kJ/mol = 1777.51 Kcal/mol
Y5+ -> Y6+ = 8970 kJ/mol = 2145.93 Kcal/mol
Y6+ -> Y7+ = 11200 kJ/mol = 2679.43 Kcal/mol
Y7+ -> Y8+ = 12400 kJ/mol = 2966.51 Kcal/mol
Y8+ -> Y9+ = 14137 kJ/mol = 3382.06 Kcal/mol
Y9+ -> Y10+ = 18400 kJ/mol = 4401.91 Kcal/mol
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