Describe how fuel oil can be changed into gasoline?

By fractional distalation which is heating something up so it boils and evaporate then the gas condenses and runs down the tube for petrol.

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts