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Atomic radius
The atomic radius is the distance from the nucleus of an atom to the outermost electron.
Electron affinity
Electron affinity (EA) is the energy change when an atom gains an electron. A more negative value indicates a stronger attraction for the electron.
Ionization energy
Ionization energy ($IE$) is the minimum energy required to remove an electron from a gaseous atom in its ground state.
Metallic character
Metallic character describes an element's tendency to lose electrons and form positive ions.