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You think to prometium and technetium; but today these chemical elements are considered as being natural.

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Q: Which two elements are lighter than uranium and are both produced artifically?
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What is uranium mass when it splits?

Splitted uranium is not uranium, but other two lighter elements.


What makes uranium lighter than other elements?

Uranium is not lighter but heavier than many of the other elements; the density of uranium is 19,05 g/cm3 and the atomic weight is 238,02891.


What describes elements that are made in particle accelerators and are not found in nature?

The elements formed in particle accelerators are usually called Synthetic Elements or Artifically Produced Elements. They are all Transuranium Elements (higher on the periodic table than Uranium), and twenty have been produced so far. Most of them disintegrate within a fraction of a second, some of them in such a short time that it is difficult to verify whether an element has been created or not.


Is uranium and radium produced from radioactive elements?

Uranium and radium, and a number of others, are natural elements found in the ground, and they are radioactive.


Are there any elements lighter than Uranium that do not occur naturally that are detectable by purely chemical means?

Today all elements from hydrogen to californium are considered as natural; lighter elements than uranium as francium, promethium and technetium are now impossible to be detected only by chemical methods.


Elements that have been produced artificially through nuclear reactions have what atomic numbers?

All the elements after Uranium(atomic no. 92) have been artificially produced.


Natural ocuring elements are?

All elements lighter than Uranium (atomic number: 92) occur naturally except for technetium (43).


The source of fuel for fission reactors is?

"Binding energy." Absorption of neutrons by heavy elements, and fission of those heavy elements into lighter "fragments". The "lighter fragements" have a greater net binding energy than the heavier elements did.


Are there any elements lighter than Uranium that do not occur naturally?

In the past promethium and technetium were considered as artificial elements; now extreme traces of these elements were discovered in the nature.


Which element is lighter among these carbon boron uranium?

Boron is lighter than carbon and uranium.


What is the fate of all the uranium that exists in the world today?

All of it will eventually break up into lighter elements.All of it will eventually break up into lighter elements.All of it will eventually break up into lighter elements.All of it will eventually break up into lighter elements.


What is a man-made element with atomic weight less than uranium?

Now all the elements lighter than uranium are discovered in the nature, even if in extremely small quatities. In the past promethium, technetium, etc. were considered only as artificial elements.