Crude oil may contain hundreds of different types of hydrocarbons. some examples include:
butane(c4h10)
dodecane (c12h26)
octane (c8h18)
benzene (c6h6)

many common fuels, such as gasoline and kerosene, are combinations of these substances or others. when these fuels burn, they combine with oxygen (o2) to produce carbon dioxide (co2) and water (h2o).

identify each of the highlighted materials as an element, a compound, or a mixture, and explain your reasoning.

beta decay is the answer

its first and third is your answer i did the qustion the fourth isnt right

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.