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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.
What else can I help you with?
The alkali metals except francium have been discovered in 1860?
Potassium and sodium - 1807 Lithium - 1817 Caesium - 1860 Rubidium - 1861 Francium - 1939
What are all the alkaline metals?
Lithium, Sodium, Potassium, Rubidium, Cesium, Francium.
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)
Which member of alkaline earth metal is least reactive?
Look at any periodic table: Beryllium #4 Magnesium #12 Calcium #20 Strontium #38 Barium #56 Radium #88
What is the family name that calcium is in?
Group 2 (alkaline earth metals): lithium, sodium, potassium, caesium, rubidium, francium.
What is the difference between alkaline metal and an earth alkaline metal?
They are both groups in the periodic table. Alkaline metals are group one. These are the least stable elements for e.g. Francium. Alkalie Earth Metals are group 2. The second most unstable elements. For e.g. Magnesium. Hope this helps!
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
What is the group of very reactive metals called?
Assuming "very reactive" to mean spontaneous and energetic in reaction, lower Alkaline metals are among the most reactive.
All alkali metals except francium had been disconerd by 1860 why did it take scientists another 80 years to find francium?
Francium is the second rarest element on earth so that's probably why it took a little longer to discover.
What is francium and the alkali metals?
Francium is a member of the alkali metals group (group 1 of the periodic table).
What are two ways that alkaline earth metals affect life?
well, one of the alkaline metals are sodium. how does salt (sodium chloride) effect you? In tons of ways. Potassium, a nearly nessisary nutrient? That effects you too, and one google search will tell you how. But a few of alkaline metals, llike Francium, are extrordinarily rare. It has no purpose or use, either. So take into concideration that a few are actually useless.
Why alkali metals are more reactive than alkaline earth metals?
All atoms want to do is make their valence shell full. In alkali metals they have all of their shells completely full except one valence electron. The alkali metals REALLY want to get rid of that electron, so they will react with many elements/compounds to get rid of that electron. In alkaline earth metals they have all of their shells completely full except for two valence electrons. They also want to get rid of those electrons but the alkaline earth metals are not as desperate to do so as the alkali earth metals which make the alkaline much less reactive than the alkali metals.
