All elements beyond uranium are known as transuranium elements and are all man made.
*The existence of these elements has been claimed and generally accepted, but not yet acknowledged by the IUPAC.
In the laboratory, using extremely high pressure, the cyclotron - various different ways. Some of them "exist" for a few thousandths of a second, but leave a "path" as it were so they can verify that they did exist. Some are relatively stable, but the amount of most of the created elements that you could hold on your thumbnail is a huge amount. Plutonium is the one they've madde the most of (unfortunately) but plutonium has been found in tiny trace amounts in nature - probablly becasue it's one of the more stable trans-Uranium elements. Most are merely lab curiosities.
These elements are called transuranic elements.
See the Periodic Table at the link below.
You can say preuranic elements but this is not an usual expression.
Uranium (U) has the atomic number 92 (meaning it has 92 protons). The element with atomic number 93 is Neptunium (Np).
These elements are called transuranic elements.
These elements are called transuranic elements; see the link below for the list of elements.
Transuranic elements
These elements are found after uranium.
all elements after uranium (atomic number 92) are radioactive.
elements after uranium (atomic number 92) are all artificially made.
A Periodic table The Periodic Table of the Elements.
Uranium is in the family of actinoids.
Uranium and arsenic are listed in the periodic table because they are elements.
These elements are found after uranium.
Below uranium in the periodic table are all the elements with atomic numbers between 1 and 91.The atomic number of uranium is 92.
Every element after 92 which is uranium
all elements after uranium (atomic number 92) are radioactive.
elements after uranium (atomic number 92) are all artificially made.
A Periodic table The Periodic Table of the Elements.
atomic number
These elements are called transuranic elements.
Because it is elemental. That is: it is not an alloy. It has a unique number of protons and neutrons.
There are many reactive elements. They show up more on the upper left of the Periodic Table. Some of these are plutonium, uranium, Mercury and lead.
- In a modern periodic table (after IUPAC rules) lanthanoids are placed above actinoids. - Before uranium are placed thorium, protactinium, actinium, etc. - After uranium are neptunium, plutonium, americium, curium, etc.