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D i think sorry if its wrong ;-;
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Free nitrogen is simply molecular nitrogen (N2). Nitrogen, in its molecular form, consists of two nitrogen atoms bound together with a tripple bond. ... So basically, any nitrogen that is in an organic compound is considered “fixed” nitrogen and N2 is considered to be “free” nitrogen
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the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
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