Ionization Energy Calculator

Calculate first, second, and third ionization energies. Determine threshold wavelengths for photoionization.

Element Selection

Element

Photon Wavelength (nm) - Optional

Enter to check if photoionization is possible

Elements by IE1:

First Ionization Energy (IE1)

496 kJ/mol

5.14 eV | Threshold: 241.4 nm

1IE1

496 kJ/mol

2IE2

4562 kJ/mol

3IE3

6910 kJ/mol

VValence e-

Large IE jump after removing 1 electron(s)

This indicates 1 valence electron(s)

Across a Period

Generally increases due to increasing nuclear charge and decreasing atomic radius.

Down a Group

Generally decreases due to increasing atomic radius and shielding effect.

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