Elements
87

Fr

Francium

Francium (Fr) is thought to be a gray colored metal that has the atomic number 87 in the periodic table. It is an Alkali Metal with the symbol Fr and is located in Group 1 of the periodic table.

Francium was discovered in 1939 by Marguerite Perey at the Curie institute in Paris. Perey was interested in the decay of actinium to produce a new element which she named after her home country, France. It was the last natural element to be discovered as anything discovered after this is a synthetic element that is made in the lab. Due to its radioactivity Francium rapidly decays meaning it is very rare. It is a solid metal at room temperature and it has a melting point of -27°c and a boiling point of 677°c. Only a few atoms of Francium have ever been isolated as creating or obtaining a large sample is very difficult. It is not known wether it would be a solid or a liquid at room temperature or what colour it would be. Francium has no commercial uses but is commonly used in subatomic experiments.

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FAQ's

What is the Melting Point for Francium?

Francium has a Melting Point of 27°F, meaning at 27°F it will turn to a liquid.

What is the Boiling Point for Francium?

Francium has a Boiling Point of 677°F, meaning at 677°F it will turn to a Gas.

What is the Electronegativity of Francium?

Francium's Electronegativty is 0.7. Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.

What is the Heat of Vaporization of Francium?

Francium has a Heat of Vaporization of kJ/mol.

Uses

Since its isotopes have such short half-lives there are no commercially significant compounds of francium.

Sources

Formed by decay of actinium. Chemical properties similar to cesium. Decays to radium or astatine.

87
Protons
87
Electrons
136
Neutrons

Fr

Element Symbol
Fr
Atomic Weight
223
Atomic Number
87
State
Solid
Melting Point
Unknown
27
°C
Boiling Point
677
Unknown
°C
Heat of Vaporization
Unknown
kJ/mol
Crystal Structure
Cubic: Body centered
Thermoconductivity
0.15
Unknown
W/cmK
Shells
2,8,18,32,18,8,1
Group
Alkali Metal
Period
7
Block
P Block
Orbitals
[Rn] 7s1
Coefficient of Thermal Expansion
--
Covalent Radius
--
Density at 293K
--
Electrical Conductivity
0.03 10^6/cm ohm
First Ionization Potential
--
Second Ionization Potential
--
Third Ionization Potential
--
Ionic Radius
--
Oxydation States
1
Lattice Parameter
--
Lattice Parameter 2
--
Lattice Parameter 3
--
Pronounced

FRAN-si-em

Discovered by

Marguerite Derey

Discovery date

1939

Orbital configuration
2,8,18,32,18,8,1

Download the Periodic Table

Explore Other Alkali Metals

22.99
11

Na

Sodium
85.468
37

Rb

Rubidium
39.098
19

K

Potassium
6.941
3

Li

Lithium
132.905
55

Cs

Caesium
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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