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Periodic table / Other metals

49Indium

Indium is an other metal in group 13, period 5. At 25 °C it is a solid.

In
Shells: 2, 8, 18, 18, 3. A simple picture: electrons do not move in circles.
Symbol
In
Atomic number
49 protons in the nucleus
Standard atomic weight
114.82 ± 0.01
Electron configuration
[Kr] 4d10 5s2 5p1
Electrons in each shell
2, 8, 18, 18, 3
Group, period, block
13, 5, p
Family
Other metals
State at 25 °C
solid
Electronegativity
1.78 (Pauling scale)
First ionisation energy
558.3 kJ/mol (5.7863558 eV)
Where these numbers come from

Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.