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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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Was Howard carter looking for king tuts tomb or did he discover it by accident?
no he had been lookng for tuts tomb for over 5 years
Is there such thing as the end of the world in 2012?
Maybe. Scientist found a calendar from the Mayans, and it is over hundreds of years old. The Mayans had a calendar and predictions about the world. Scientist discovered that the Mayans predicted that the world would end on 2012. Hundreds of years ago, the Mayans predicted that astronauts would land on the moon, and as many years passed by, we have astronauts that landed on the moon! So if their prediction was right, does this mean that their prediction of the world ending on 2012 is going to be true also?....
When did Jean-Francois Champollion discover the hieroglyphics?
He didn't "discover hieroglyphs", since they were all over Egypt on monuments and tombs and people had known about them for thousands of years before he was born. He helped to translate hieroglyphs, which is not the same thing.
How has gymnastics changed over there years?
yes it has changed over many years
What is Max Plancks education?
his education was that he discover the modern physics. with out that we would be over weight people that's why its very important that he dicoverd that (:
Why did it take over eighty years to discover Francium?
It is highly unstable. The MOST stable isotope of this stuff has a half life of 22 minutes.
How did scientist discover the periodic table over the years?
Please see this article for more details.
When did scientist discover the ozone whole?
The ozone hole was discovered by Dr. Farman. He discovered it over Antarctica.
When is francium a gas?
At a temperature over 677 0C francium may be a gas.
Why did it take over 80 years to discover francium?
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 did early humans discover over thousandsof years?
The early humans discovered and started to use fire some 500,000 years ago. It took hundreds of thousand years to discover how to make fire.
Over 300 years ago scientist Robert Hook identified what?
cells
What scientist first described buoyancy over 2000 years ago?
Archimedes
When was tin discover?
Tin is one of the earliest known metals and is over 5550 years old.
How many degrees do scientist expect the average global temperature to increase to over the next100 years?
i believe it would be 250 degrees over the next 100 years.
What kind of person studies changes in the Earth that take place over millions and billions of years?
Scientist
How have fairies changed over the years?
They have been around for millions of years. They dont like when humans discover them. But fairies are real!!
