element

First ionization energy

Second ionization energy

experiment value [15]

calculated value

experiment value [15]

calculated value

Zn

0.9064

0.9099

1.7333

1.7738

Cu

0.7455

0.7756

1.9579

2.0077

Ni

0.7367

0.7628

1.753

1.8068

Fe

0.7594

0.7212

1.561

1.5906

Co

0.758

0.7448

1.646

1.74336

Sc

0.631

0.6245

1.235

1.2682

Ti

0.658

0.6377

1.31

1.3573

Cr

0.6528

0.6784

1.496

1.6349

Mn

0.7174

0.7258

1.5091

1.5341