Select the keyword or phrase that will best complete each sentence. Key terms: inorganic chemistry The study of compounds that contain the element carbon is known as vitamins A is an atom or group of atoms with characteristic chemical and physical properties. homoatom A compound that contains only the elements of carbon and hydrogen are known as heteroatom hydrogen is any atom in an organic compound that is not carbon or organic chemistry functional group Organic compounds that must be obtained in the diet and is needed in small amounts for normal cell function are known as hydrocarbons