Anion Apr 2026

Anions are typically formed by . According to the octet rule , atoms often gain electrons until their outermost shell is full, typically containing eight electrons. This process is driven by the atom's electronegativity—its ability to attract and hold onto electrons.

Anions exist in various forms, from simple atoms to complex molecular groups: Cation vs Anion: Definitions & Periodic Table Guide Anions are typically formed by

: The number of electrons gained is indicated by a superscript after the chemical symbol (e.g., Cl−cap C l raised to the negative power for a gain of one electron, O2−cap O raised to the 2 minus power for a gain of two). it becomes an anion.

: When an atom gains an electron, it becomes an anion. Anions are typically formed by