Atomic Element Z = 49 • Post-Transition Metal
Indium (In) — Atomic Data, Electron Shells & Reactions
Indium (symbol In, atomic number 49) has a standard atomic weight of 114.82 u and ground-state configuration [Kr] 4d10 5s2 5p1.
Atomic Number (Z)
49
IUPAC Symbol
In
Standard Atomic Weight
114.82 g/mol
Period / Group / Block
5 / 13 / p-block
Condensed Electron Config
[Kr] 4d10 5s2 5p1
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p1
Principal Shell Occupancy
[2, 8, 18, 18, 3]
Pauling Electronegativity
1.78
First Ionization Energy
558 kJ/mol
Covalent Radius
142 pm
Melting Point
429.75 K (156.60 °C)
Boiling Point
2345 K (2071.85 °C)
Density
7.31 g/cm³
Oxidation States
+3
In (Z=49) — Valence shell highlighted in vermilion