Crude oil is a mixture of many compounds that can be separated using which process

Fractional distillation

Explanation:

Fractional distillation is a process in which the components of the mixture are separated by using a boiling method. Crude oil is a mixture of hydrocarbons. It is separated by the process of fractional distillation. The oil is heated at the bottom of a glass tower, the different volatile components are extracted in the form of vapors.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.