How do covalent bonds form?

Question

Henry Antrim · Accepted Answer

The" sharing" of electrons between two non-metal elements.

Covalent bonding arises from the fundamental idea that all elements want to achieve a stable configuration of an outer shell consisting of 8 electrons.

This can be achieved in different ways, but in the case of covalent bonding 2 atoms "share" their electrons with the other atom. This is especially seen among the halogens (group 7/17) where all the elements are said to be diatomic as they are made up of 2 atoms bonded together by covalent bonding. e.g #Cl_2#. On it's own each atom from a group 7/17 elements would have 7 valence electrons, but as they "share" they have a full shell which is much more stable.

Note that this type of bondings is only possible between two elements considered as non-metals (between a metal and a non-metal the bond would be ionic) .Another famous example would be Carbon, which has 4 valence electrons. Methane, #CH_4#, is a carbon atom covalently bonded to 4 separate hydrogen atoms!

In the diagram below you see that the crosses are the atoms that "belong" to the Carbon atom and the dots are atom belonging to the hydrogens, but they share them.

Cooper Anderson · Answer

undefined When two atoms share electrons, covalent bonds are created.

Olivia Anton · Answer

undefined Covalent bonds form when atoms share one or more pairs of electrons to achieve a stable electron configuration. This sharing occurs between nonmetal atoms, as they have similar tendencies to attract electrons. Atoms come together and overlap their outermost electron orbitals, resulting in the sharing of electron pairs between them. This sharing creates a bond between the atoms, known as a covalent bond.