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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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15y ago

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The alkali metals except francium have been discovered in 1860?

Potassium and sodium - 1807 Lithium - 1817 Caesium - 1860 Rubidium - 1861 Francium - 1939


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Francium is a member of the alkali metals group (group 1 of the periodic table).


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Yes, francium is a member of the alkali metals family (group 1).


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Francium is a member of the alkali metals family.


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Francium is in the period 7 and group 1 of the periodic table (alkali metals).


All of the alkali metals except francium were discovered by 1860. Why did it take scientists nearly another 80 years to discover francium?

Francium is named after France, which is where the element was isolated in 1939 by Marguerite Perey. Traces of francium occur naturally in uranium-containing minerals. francium is very rare so it took time to find it (i think)


Are cesium potassium and francium all alkali metals?

Yes, all are alkali metals.


What block is francium in?

Francium is in the group 1 of the periodic table (alkali metals).


Are alkali metals in groupe 1 elements?

Alkali metals are the metals in family/group I.Lithium, sodium, potassium, Rubidium, Cesium, Francium are Alkali metals.


Where are the alkali metals?

The alkali metals are the metals found in group I, includinng lithium, sodium, potassium, rubidium, caesium and francium.


What is the group number for francium?

Francium is in the group 1 (alkali metals) of the periodic table.


What is the reaction when water combines with francium?

2Fr + 2H2O -----> 2FrOH + H2 However, francium decays too quickly to exist in nature. A brilliant video for the alkali metals (except francium), can be found in related links