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Lambang oksigen = O
Lambang Nitrogen = N
Awalan yang menunjukkan banyak atom unsur non logam adalah,
mono = 1
di = 2
tri = tiga
tetra = empat
penta = 5
Fosfor pentaoksida ⇒ PO₅
Dinitrogen pentaoksida ⇒ N₂O₅