What types of atoms typically form covalent bonds?

Answer

Atoms that typically form covalent bonds with each other have similar electronegativity, which expresses the atom's tendency to attract electrons, such as with carbon and hydrogen, which form methane. They stand in contrast to ionic bonds, where electronegativities are vastly different, as with sodium and chlorine, which combine to form table salt. These actually exist on a continuum with significant but lesser differences in electronegativity causing the formation of polar molecules.

Most bonds between atoms are at least somewhat covalent. Purely covalent bonds exist in molecules that contain only two or more atoms of the same element. Examples include oxygen, nitrogen, hydrogen and chlorine gases.

Molecules only really exist where the bonds between atoms have covalent character, which means that the electrons are at least partially shared by the member elements of the molecule. In fully ionic bonds, as in table salt, the bond between the ions is purely based on opposite charge, and each sodium ion in a pure salt crystal can be said to share an equivalent bond with each chloride ion surrounding it in its crystal lattice. If such an ionic compound were viewed as a molecule, it would actually be the size of the entire salt crystal.

Q&A Related to "What types of atoms typically form covalent..."
The question is probably more "Which elements form covalent bonds? Ionic bonds are between a metal and a non-metal. COVALENT bonds are between two non-metals.
http://wiki.answers.com/Q/What_types_of_atoms_form...
Any atom bonding to another atom by jointly using electrons is
http://www.chacha.com/question/what-type-of-atoms-...
The ones with a medium (not high or low) numer of valence electrons. ex. carbon, oxygen, nitrogen.
http://answers.yahoo.com/question/index?qid=201010...
Metals and non-metals.
http://wiki.answers.com/Q/What_type_of_atoms_combi...
Explore this Topic
Covalent bonds are formed when two atoms, with unstable electron orbits, bond together by sharing pairs of electrons to form a more stable molecule. ...
Covalent bonds form when two atoms share a pair of electrons. All covalent bonds are polar to some extent, unless the two atoms are the same. A polar covalent ...
The two types of bonds are ionic and covalent. They are different because in ionic bonds, the atoms take the bonds from each other and form ions. In covalent bonds ...
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