Isoelectronicity

[Nathan Mariano 2G]

What is the isoelectronicity? How do we find if one element is isoelectronic to another element?

[Swetha Ampabathina1I]

Isoelectronicity is when elements/molecules have the same number of valence electrons and electron configurations. For example, Li+ and He are isoelectronic. Most isoelectronic elements also have similar chemical properties.

[505211599]

Isoelectronicity is defined by two or more elements or ions having the same electronic configuration.

[Dayna Pham 1I]

Isoelectronicity is the phenomenon when two different atoms/ions have the same number of electrons.

For example, Na and Mg+ are isoelectronic, since Na and Mg+ both have 11 electrons. (Mg has 12 electrons in its neutral state, then it loses an electron, having 11).

Isoelectronicity is an important concept to apply to atomic radius and ionic radius, because when two atoms/ions are isoelectronic, the determining factor to discover the atomic radius and ionic radius is the number of protons.

For example, Na and Mg+ both have 11 electrons, but Mg+ has more protons (12) than Na (11). Therefore, Mg+ is smaller than Na, since the more positive charge in the nucleus pulls the shells in more.

Hope this helped!