kaksoissidosta
Kaksoissidosta (Finnish for "double bond") refers to a type of covalent bond between two atoms in which four electrons are shared, commonly represented by an equals sign (e.g., C=C). Structurally, a double bond consists of one sigma bond formed by end-to-end overlap of orbitals and one pi bond formed by side-by-side overlap of p orbitals. This bonding arrangement shortens and strengthens the connection between the bonded atoms relative to a single bond, while being weaker than a triple bond.
Double bonds impose geometric constraints: atoms directly bonded to the doubly linked atoms typically adopt trigonal
Chemically, double bonds are more reactive than single bonds and commonly undergo addition reactions such as
Double bonds are important in biological molecules (for example, unsaturated fatty acids), materials science and organic