To select an element: Click on an element in the grid below.
To view all successive ionisation energies: Ensure the ‘Full graph’ option is checked on the graph.
To view the ionisation energies step-wise: Ensure the ‘Step-wise’ option is selected, then click the ‘+’ and ‘−’ symbols to increment and decrement the charge, building the graph point by point and seeing the changes to the electron configuration.
Electron configuration of Hydrogen
Successive ionisation energies of Hydrogen
Note: data points marked with a ‘*’ are theoretical, not measured values