Kaksoisidos

Kaksoisidos is a term of Finnish origin that translates to "double bond" in English. In chemistry, a double bond is a covalent chemical bond between two atoms involving four shared electrons. This is in contrast to a single bond, which involves two shared electrons. Double bonds are stronger and shorter than single bonds between the same two atoms. They are commonly found in organic molecules, such as alkenes, where two carbon atoms are linked by a double bond. For example, ethene (C2H4) contains a carbon-carbon double bond. Double bonds can also occur between other pairs of atoms, like oxygen in carbon dioxide (CO2) or nitrogen in molecular nitrogen (N2). The presence of a double bond affects the molecule's geometry, reactivity, and spectroscopic properties. For instance, the pi electrons in a double bond are more accessible for chemical reactions compared to the sigma electrons in a single bond, making double bonds a common site for addition reactions.