In
Indium · element 49
Post-Transition Metal · Solid at room temperature
Indium is a chemical element with symbol In and atomic number 49. It is a post-transition metallic element that is rare in Earth's crust. The metal is very soft, malleable and easily fusible, with a melting point higher than sodium, but lower than lithium or tin.
Key facts
Atomic mass
114.8181 u
how heavy one atom is
Phase (room temp.)
Solid
Density
7.31 g/cm³
how tightly packed it is
Melting point
429.748 K (157 °C)
when solid turns to liquid
Boiling point
2345 K (2072 °C)
when liquid turns to gas
Period
5
its row in the periodic table
Group
13
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
1.78
how strongly it pulls electrons
Electron configuration
[Kr] 4d10 5s2 5p1
where its electrons live
Shells
2 · 8 · 18 · 18 · 3
electrons in each layer, inside to out
Discovered by
Ferdinand Reich
who found it
Appearance
silvery lustrous gray
what it looks like
Source: Wikipedia