Elements
37

Rb

Rubidium

Rubidium (Rb) is a silver-white coloured metal that has the atomic number 37 in the periodic table. It is an Alkali Metal and is located in Group 1 of the periodic table. it has the symbol Rb.

Rubidium unlike other Alkali metals will not float on water due to its high density. Rubidium was discovered in 1861 by German chemists Robert Bunsen and Gustav Kirchhoff using spectroscopy. They analysed the mineral lepidolite and witnessed a bright red emission line. Rubidium is named after the Latin ‘rubidus’ which means deep red. Rubidium has a number of uses, primarily in fireworks. Rubidium’s isotopes exhibit radioactive activity and Rb 87 is commonly sed in laser cooling and also in atomic clocks. It is located in Group 1, an Alkali metal. It has a melting point of 39.9°c and a boiling point of 688°c.

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FAQ's

What is the Melting Point for Rubidium?

Rubidium has a Melting Point of 39°F, meaning at 39°F it will turn to a liquid.

What is the Boiling Point for Rubidium?

Rubidium has a Boiling Point of 688°F, meaning at 688°F it will turn to a Gas.

What is the Electronegativity of Rubidium?

Rubidium's Electronegativty is 0.82. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Rubidium?

Rubidium has a Heat of Vaporization of 72.216 kJ/mol.

Uses

Used as a catalyst, photocells, and vacuum and cathode-ray tubes.

Sources

Occurs abundantly, but so widespread that production is limited. Usually obtained from lithium production.

37
Protons
37
Electrons
48
Neutrons

Rb

Element Symbol
Rb
Atomic Weight
85.468
Atomic Number
37
State
Solid
Melting Point
Unknown
39
°C
Boiling Point
688
Unknown
°C
Heat of Vaporization
72.216
Unknown
kJ/mol
Crystal Structure
Cubic: Body centered
Thermoconductivity
0.582
Unknown
W/cmK
Shells
2,8,18,8,1
Group
Alkali Metal
Period
5
Block
S Block
Orbitals
[Kr] 5s1
Coefficient of Thermal Expansion
91 10^-6 K^-1
Covalent Radius
2.16 Å
Density at 293K
1.53 g/cm³
Electrical Conductivity
0.0779 10^6/cm ohm
First Ionization Potential
4.1771 V
Second Ionization Potential
27.28 V
Third Ionization Potential
40.0 V
Ionic Radius
1.61 (+1) Å
Oxydation States
1
Lattice Parameter
5.70 Å
Lattice Parameter 2
--
Lattice Parameter 3
5.1479 Å
Pronounced

roo-BID-i-em

Discovered by

R. Bunsen, G. Kirchoff

Discovery date

1861

Orbital configuration
2,8,18,8,1

Download the Periodic Table

Explore Other Alkali Metals

132.905
55

Cs

Caesium
39.098
19

K

Potassium
223
87

Fr

Francium
6.941
3

Li

Lithium
22.99
11

Na

Sodium
The alkali metals, found in group 1 of the periodic table (formally known as group IA), are so reactive that they are generally found in nature combined with other elements. The alkali metals are shiny, soft, highly reactive metals at standard temperature and pressure.
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