Element 87 (Francium) was discovered in 1939 by the French scientist Marguerite Perey. The pure element is hard to isolate, as it has a radioactive half-life of about 21 minutes.
It is also one of the rarest elements: there is probably less than a hundred grams of it on Earth!
The reason it toke so long to discover because it is a unstable element The reason it toke so long to discover because it is a unstable element The reason it toke so long to discover because it is a unstable element
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.
The total amount of the francium in the Earth crust is approx. 30 grams.
1 million years
6-12 years
it took mendleev FROM 1872 TO 1871. He figured it out in a dream that he had had whilst trying to figure out the problem
it will take hundreds of years to break down.
5 years - 7 years
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)
The total amount of the francium in the Earth crust is approx. 30 grams.
Take a look at a periodic table. All elements after Uranium were discovered fairly recently, within the last 100 years or so. Some others, such as Technetium and Francium, were also discovered in that time.Take a look at a periodic table. All elements after Uranium were discovered fairly recently, within the last 100 years or so. Some others, such as Technetium and Francium, were also discovered in that time.Take a look at a periodic table. All elements after Uranium were discovered fairly recently, within the last 100 years or so. Some others, such as Technetium and Francium, were also discovered in that time.Take a look at a periodic table. All elements after Uranium were discovered fairly recently, within the last 100 years or so. Some others, such as Technetium and Francium, were also discovered in that time.
The total amount of the francium in the Earth crust is approx. 30 grams.
The total amount of the francium in the Earth crust is approx. 30 grams.
I'm doing homework on francium for my school the question is... The last element to be discovered had to wait until something else was discovered. What was this? So there had to be something else discovered before it was discovered but i don't know what that other something is help... my homeworkd due in tomorrow.
Francium is the second rarest element on earth so that's probably why it took a little longer to discover.
Back then they did not know what radioactivity was There wasn't the right equipment to discover it at the time It comes from Uranium, which doesn't last for that long...it has a half life of 21 minutes Very rare, 30g in the world at one time
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.
The total amount of the francium in the Earth crust is approx. 30 grams.
cause i needed a big pis and then got tired it was my fault it took so long [[[[:)
The total amount of the francium in the Earth crust is approx. 30 grams.