a compound in which two covalent bonds are formed
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What Are Some Examples of Covalent Compounds?
Common Covalent Compounds
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ThoughtCo / Adrian Mangel
byAnne Marie Helmenstine, Ph.D.
Updated June 06, 2019
These are examples of covalent bonds and covalent compounds. Covalent compoundsalso are known as molecular compounds. Organic compounds, such as carbohydrates, lipids, proteins, and nucleic acids, are all examples of molecular compounds. You can recognize these compounds because they consist of nonmetals bonded to each other.
PCl3 - phosphorus trichloride
CH3CH2OH - ethanol
O3 - ozone
H2 - hydrogen
H2O - water
HCl - hydrogen chloride
CH4 - methane
NH3 - ammonia
CO2 - carbon dioxide
So, for example, you would not expect to find covalent bonds in a metal or alloy, such as silver, steel, or brass. You would find ionic rather than covalent bonds in a salt, such as sodium chloride.
Answer:
Oxygen molecule is formed by two oxygen atoms.each oxygen has six valence electrons .hence double bond is formed.