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In addition to the considerable array of oxygen compounds discussed thus far, it is possible for oxygen to assume a positive oxidation state. This would be expected in covalent compounds only in cases where the other element is fl uorine, the only atom having a higher electronegativity. Several compounds containing oxygen and fl uorine have been studied, with the best-known being OF 2 , oxygen difl uoride. It is a pale yellow poisonous gas that has a b.p. of 145 °C. Oxygen difl uoride can be prepared by the reaction of fl uorine with a dilute solution of sodium hydroxide,