Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Molecular orbital theory explains how the naturally occurring form of this element contains a double bond and is paramagnetic. This element was named dephlogisticated air when it was discovered by Joseph Priestley. An ether contains an atom of this element bonded to two alkyl groups. This element has the second highest electronegativity behind fluorine and reacts with a hydrocarbon in a typical combustion reaction. For 10 points, name this element, three of which are bonded to nitrogen in a nitrate ion.
Science