Final answer:
Atoms and ions that have the same electron configuration are said to be isoelectronic.
Step-by-step explanation:
Atoms and ions that have the same electron configuration are said to be isoelectronic. Examples of isoelectronic species are N³, 0²-, F¯, Ne, Na+, Mg2+, and Al³+. For atoms or ions that are isoelectronic, the number of protons determines the size. The greater the nuclear charge, the smaller the radius in a series of isoelectronic ions and atoms.