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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.
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∙ 14y ago
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Why was francium not discovered?
Francium was discovered, see the link.
When did element francium discovered?
Francium was discovered by Marguerite Perey in 1939.
When was the element francium discovered and by whom?
Francium was discovered by Marguerite Perey in 1939.
Who discovered Francium?
Marguerite Perey Francium was discovered by Marguerite Perey in France in 1939.
Where francium was discovered?
Francium was discovered by Marguerite Perey in 1939, in Paris (France)..
The discovery of francium?
Francium was discovered by Marguerite Perey in 1939.
What makes francium?
Francium was discovered by Marguerite Perey in 1939.
Who discrovered francium?
Francium was discovered by Marguerite Perey in 1939.
When did francium get made?
Francium was discovered by Marguerite Perey in 1939.
Francium 80 years?
Francium was discovered by Marguerite Perey in 1939.
Francium invented later?
Francium was discovered by Marguerite Perey in 1939.
Why scientists francium 80 years?
Francium was discovered by Marguerite Perey in 1939.
