The Element Francium


Francium was discovered by Marguerite Perey in France in 1939, thus the origin of the name francium named after France. It occurs as a result of α disintegration of actinium and can be found in uranium minerals where the element can be artificially produced by bombarding thorium with protons. It is the last element to be discovered in nature except for those that are synthesized.

It is extremely rare to find francium outside the laboratories, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays. As per the industrial applications, francium serves no industry due to its extreme instability and rarity.

Atomic Number & Chemical Properties


Element Basics:

Chemical Symbol: Fr
Atomic Number: 87
Atomic Weight: 223.0197
Element Classification: Alkali Metal
Discovered By: Marguerite Derey
Date of Discovery: 1939 (France)
Origin of Name: Named for France, the nation of its discovery.

How to Recognize it at a Party:

n/a

Seriously Atomic Information:

Density (g/cc): n/a
Melting Point (°K): 300
Boiling Point (°K): 950
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): n/a
Ionic Radius: 180 (+1e)
Pauling Negativity Number: 0.7
First Ionizing Energy (kJ/mol): ~375
Oxidation States: 1
Electronic Configuration: [Rn] 7s1

Getting Intimate with Francium:

Lattice Structure: Body-Centered Cubic (BCC)
Lattice Constant (Å): n/a
Lattice C/A Ratio: n/a
Specific Heat (@20°C J/g mol): n/a
Fusion Heat (kJ/mol): 15
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25°C W/m K):
Debye Temperature (°K): n/a


Society's Questions About Francium:

Have you ever wondered what everyone else in the world thinks about Francium? Is anyone else looking for it too? If so, why? What do they want?

The following list shows the most common online questions about the element Francium. Are your questions the same or different from everyone else's?

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