1. As a natural element francium exist in infinitesimal concentrations in uranium ores (as a progeny of 235U in the decay chain).
2. Francium can be also obtained by nuclear reactions:
197Au + 18O----------210Fr + 5 n
The compound formed between sodium and francium would be NaFr, with sodium as the cation and francium as the anion. This compound would have a 1:1 ratio of sodium to francium ions.
When francium and oxygen react, francium oxide is formed. This compound is highly reactive and unstable due to francium's extreme reactivity. Francium is a highly radioactive element and is extremely rare in nature.
After a violent reaction the francium hydroxide should be formed.
When francium and hydrogen combine, they form francium hydride (FrH), a compound where francium acts as a cation and hydrogen as an anion. Francium is extremely rare and radioactive, making it difficult to study its chemical properties in detail. The compound would likely be highly unstable due to francium's extreme reactivity.
'FrCl' is Francium chloride. NB Francium(Fr) is the heaviest of the Group(I) [Alkali] metals. You will not find it in the open lab. because it is radioactive.
Francium reacts very vigorously with water, producing francium hydroxide and hydrogen gas. This reaction occurs because francium is an alkali metal and easily loses its outer electron when in contact with water, releasing energy in the form of heat and causing the explosion-like reaction.
Very probable, after a violent reaction the hydroxide FrOH should be formed.
Fr+1 or Fr+, because Francium is an alkali metal (like Na or K) and forms 1+ charged ions by reduction of other substances (very reactive, explosive reaction, even with water!).
Uranium-235 decays to form helium and francium through a series of alpha and beta decay reactions. Helium is typically produced as an alpha particle, while francium is formed as the end product of the decay chain.
Not known today but probably francium don't burn.
Very probable, after a violent reaction the hydroxide FrOH should be formed.
Francium has not applications and the oxide cannot be prepared.