11 neon ← sodium → magnesium Li ↑ Na ↓ K periodic table General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22.98976928(2) g/mol Electron configuration [Ne] 3s1 Electrons per shell 2, 8, 1 Physical properties Phase solid Density (near r.t.) 0.968 g·cm−3 Liquid density at m.p. 0.927 g·cm−3 Melting point 370.87 K (97.72 Â°C, 207.9 Â°F ...
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