biatomic
As biatomar is a chemical compound referred to, which consists of two atoms is assembled. The atoms can come from the same or different elements .
The halogens fluorine , chlorine , bromine and iodine are elements that are present in the gas phase in the biatomic state E 2 (E stands for the respective element). The reason for this is the incompletely occupied valence electron level. Halogens lack one electron to achieve a stable octet , which is created by sharing an electron pair ( single bond ) with a second atom. Hydrogen also stabilizes its valence electron level. Deviating from the octet rule, this is occupied by only two electrons ( helium configuration), since no further orbitals are available. Oxygen is missing two electrons , nitrogen three electrons to reach the octet, which is why they are biatomic in the gas phase via the formation of a double bond ( two shared electron pairs) or triple bond ( three shared electron pairs). In the case of the elements, polyatomic elements - in contrast to atomic occurrences - are also referred to as “ molecular ”.
Examples of biatomic compounds with two atoms of different elements are carbon monoxide (CO) and hydrogen fluoride (HF). The group of all chemical compounds made up of two different elements is also referred to as “ binary compounds ”, regardless of the number of atoms .