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Why Francium is not in Mendeleev Periodic Table?
Francium was discovered in 1939, several decades after Mendeleev created his periodic table in 1869. At the time Mendeleev developed his table, francium had not yet been identified, and elements were organized based on their known properties and atomic weights. Additionally, francium is a highly radioactive and unstable element, which made it difficult to study and include in early classifications of elements.
Is francium combustible?
Not known today but probably francium don't burn.
What is a use of francium oxide and What is a compound of francium Is a compound francium oxide?
Francium has not applications and the oxide cannot be prepared.
Is francium a metalliod?
Francium is a metal.
How was francium named francium?
Francium was named after France, the country it was dicovered in.
What are chemical properties of francium?
The chemistry of francium is not known; francium has properties similar to caesium.
Why is the density of francium unknown?
We haven't sufficient francium for a measurement; also francium is autovaporized.
What is francium made out of?
As francium is a chemical element, it is made up of protons, neutrons and electrons.
Is francium synthetic and radioactive?
Francium is a radioacive chemical element; francium is natural but also may be prepared in laboratory.
Why did it take scientist 80 year to discover francium?
Francium is a natural chemical element but the total quantity of francium in the earth crust is only approx. 30 g. Francium has ca. 40 isotopes and isomers but only two are natural: 221Fr (in the neptunium decay chain series) and 223Fr (in the actinium decay chain series). Artificially preparation of francium isotopes is also extremely difficult and expensive; and the chemistry and physics of isotopes was developed essentially after 1940. Supplementary, the most stable isotope of francium has a half life of only 21,8 minutes and is strongly radioactive; the half lives of the artificially prepared isotopes are more smaller. This is sufficient reason to explain why francium was later discovered and why even today is only slightly studied.
How expensive is francium?
Francium is not a commercial product.
Where can you bye francium?
Francium is not a commercial product.
