Rb
Rubidium · element 37
Alkali Metal · Solid at room temperature
Rubidium is a chemical element with symbol Rb and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, such as very rapid oxidation in air.
Key facts
Atomic mass
85.46783 u
how heavy one atom is
Phase (room temp.)
Solid
Density
1.532 g/cm³
how tightly packed it is
Melting point
312.45 K (39 °C)
when solid turns to liquid
Boiling point
961 K (688 °C)
when liquid turns to gas
Period
5
its row in the periodic table
Group
1
its column in the periodic table
Block
S-block
the neighbourhood it lives in
Electronegativity
0.82
how strongly it pulls electrons
Electron configuration
[Kr] 5s1
where its electrons live
Shells
2 · 8 · 18 · 8 · 1
electrons in each layer, inside to out
Discovered by
Robert Bunsen
who found it
Appearance
grey white
what it looks like
Source: Wikipedia