← Periodic Table Elements 1-20 by atomic number Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All 1 H Hydrogen 1 2 He Helium 4 3 Li Lithium 7 4 Be Beryllium 9 5 B Boron 11 6 C Carbon 12 7 N Nitrogen 14 8 O Oxygen 16 9 F Fluorine 19 10 Ne Neon 20 11 Na Sodium 23 12 Mg Magnesium 24