Recognised as Chemical element
Indium
- In
- Z = 49
- post-transition metal
Indium (In) is element 49, a post-transition metal in period 5 and group 13. Its standard atomic weight is 114.82 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolIn
Standard atomic weight114.82atomic mass units (Da)
Mass in kilograms1.906631 × 10^-25
Categorypost-transition metal
Group13
Period5
Blockp-block
Electrons in a neutral atom49
Neutrons in the most common isotope66≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹ground state, subshells written in order of n
Noble gas shorthand[Kr] 4d¹⁰ 5s² 5p¹
Electrons per shell2, 8, 18, 18, 3K, L, M and outward
Electrons in the outer shell3
Unpaired electrons1Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass114.82 g/mol
Mass of one mole114.82 grams
Atoms in one gram5.2448535 × 10^21
Mass of one atom1.906631 × 10^-22 g
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