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number symbol name group period phase shells category mass density molar heat affinity configuration boiling point melting point
1 H Hydrogen 1 1 Gas [1] diatomic nonmetal 1.01 0.09 28.84 72.77 1s1 20.271 13.99
2 He Helium 18 1 Gas [2] noble gas 4.00 0.18 0.00 -48.00 1s2 4.222 0.95
3 Li Lithium 1 2 Solid [2, 1] alkali metal 6.94 0.53 24.86 59.63 [He] 2s1 1603 453.65
4 Be Beryllium 2 2 Solid [2, 2] alkaline earth metal 9.01 1.85 16.44 -48.00 [He] 2s2 2742 1560
5 B Boron 13 2 Solid [2, 3] metalloid 10.81 2.08 11.09 26.99 [He] 2s2 2p1 4200 2349
6 C Carbon 14 2 Solid [2, 4] polyatomic nonmetal 12.01 1.82 8.52 121.78 [He] 2s2 2p2
7 N Nitrogen 15 2 Gas [2, 5] diatomic nonmetal 14.01 1.25 0.00 -6.80 [He] 2s2 2p3 77.355 63.15
8 O Oxygen 16 2 Gas [2, 6] diatomic nonmetal 16.00 1.43 0.00 140.98 [He] 2s2 2p4 90.188 54.36
9 F Fluorine 17 2 Gas [2, 7] diatomic nonmetal 19.00 1.70 0.00 328.16 [He] 2s2 2p5 85.03 53.48
10 Ne Neon 18 2 Gas [2, 8] noble gas 20.18 0.90 0.00 -116.00 [He] 2s2 2p6 27.104 24.56
11 Na Sodium 1 3 Solid [2, 8, 1] alkali metal 22.99 0.97 28.23 52.87 [Ne] 3s1 1156.09 370.944
12 Mg Magnesium 2 3 Solid [2, 8, 2] alkaline earth metal 24.31 1.74 24.87 -40.00 [Ne] 3s2 1363 923
13 Al Aluminium 13 3 Solid [2, 8, 3] post-transition metal 26.98 2.70 24.20 41.76 [Ne] 3s2 3p1 2743 933.47
14 Si Silicon 14 3 Solid [2, 8, 4] metalloid 28.09 2.33 19.79 134.07 [Ne] 3s2 3p2 3538 1687
15 P Phosphorus 15 3 Solid [2, 8, 5] polyatomic nonmetal 30.97 1.82 23.82 72.04 [Ne] 3s2 3p3