katiooni

Katiooni is the genitive singular form of the Estonian noun katioon, which denotes a positively charged ion in chemistry. In scientific and educational contexts, katioon corresponds to the concept of a cation, used in contrast with anioon, the negatively charged ion. The form katiooni is used to indicate possession or relation, for example in phrases such as katiooni laeng (the charge of the cation) or katiooni elektronid (the cation’s electrons).

As a grammatical form, katiooni does not represent a separate lexical item beyond the noun katioon. It appears whenever Estonian syntax requires the genitive case to express ownership, association, or description related to the cation. This usage is common in chemistry texts, lecture notes, and other academic writing in Estonian.

Etymology and related terms: katioon is a borrowing from English cation, which in turn traces its origins to the Greek word katíon. The Estonian form katiooni reflects its grammatical role as the genitive singular of katioon. Related terms include anioon (negatively charged ion) and other ion-related vocabulary used in chemistry.

See also: katioon, anioon, ion, electrostatics, chemical ionization.

Note: In everyday Estonian, katiooni is primarily encountered as a grammatical form within sentences. When discussing the concept in general, speakers typically use the nominative katioon to refer to the concept itself, while katiooni appears in cases requiring possession or relation.