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Indium ✕
Symbol In
Atomic number 49
Chemical property Post-​transition metal
Origin o the name indigo
Group 13
Period 5
Atomic weight (u) 114.818
Atomic weight uncertainty (u) 0.001
Density (g/cm³) 7.31
Melting point (K) 429.75
Boiling point (K) 2345
Heat capacity (J/(g·K)) 0.233
Electro-negativity 1.78
Abundance in earth's crust (mg/kg) 0.25