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(#1) H Hydrogen (#2) He Helium (#3) Li Lithium (#4) Be Beryllium (#5) B Boron (#6) C Carbon (#7) N Nitrogen (#8) O Oxygen (#9) F Fluorine (#10) Ne Neon (#11) Na Sodium (#12) Mg Magnesium (#13) Al Aluminum (#14) Si Silicon (#15) P Phosphorus (#16) S Sulfur (#17) Cl Chlorine (#18) Ar Argon (#19) K Potassium (#20) Ca Calcium