e/Two-electron atom

Information
has gloss	eng: 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.
lexicalization	eng: two-electron atom
instance of	(noun) (physics and chemistry) the smallest component of an element having the chemical properties of the element atom