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what is the symbol of hydrogen, heluim, nitrogen,

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Kaiusviz
Hydrogen - H, Helium - He, and Nitrogen - N
JthanSCOUTviz
Hydrogen - H (but usually others write it as H₂ because it is a diatomic molecule)
Helium - He
Nitrogen - N (like hydrogen, it is sometimes written as N₂)