Two-electron atom

In atomic physics, a two-electron atom or helium-like ion is a quantum mechanical system consisting of one nucleus with a charge of Ze and just two electrons. This is the first case of many-electron systems where the Pauli exclusion principle plays a central role.

It is an example of a three-body problem.

The first few two-electron atoms are:

Z = 1:H−hydrogen anion
Z = 2:Hehelium atom
Z = 3:Li+lithium ion
Z = 4:Be2+beryllium ion
Z = 5:B3+boron ion
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