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Four shared electrons are known as a double bond and six shared electrons are known as a triple bond. The oxygen we breathe consists of two oxygen atoms sharing four electrons in a double bond. Methane, or natural gas, is a covalent compound made of one carbon bonded to four hydrogens via single bonds.earn about covalent bonds, how covalent compounds are formed and the properties inherent to covalent compounds, such as low melting and boiling points, in this lesson. Also, learn what rules to follow to name simple covalent compounds.
Carbon dioxide, or #CO_2#, has three resonance structures, out of which one is a major contributor. The #CO_2# molecule has a total of 16 valence electrons - 4 from carbon and 6 from each oxygen atom. Here are the three resonance structures for #CO_2#, all accounting for the 16 valence electrons. The atoms in all three resonance structures have full octets; however, structure 1 will be more stable, and thus contribute more, because it has no separation of charge.