Superactinide

The **superactinides** are a group of hypothetical elements predicted to be elements 121–156, one of which is expected to have a magic number of protons and neutrons – unbihexium. An isotope of unbihexium is expected to have 126 protons and 184 neutrons. Before the Superactinides, there are Ununennium and Unbinilium. As of 2025, none have been found. The elements in this block are considered g-block elements.

## Superactindes
### Unbiunium
Unbiunium, also known as eka-actinium, was attempted to be synthesized in 1977 by  shooting Copper-65 at Uranium-238. It was unsuccessful and no atoms were identified.

### Unbibium
Unbibium, also known as eka-thorium, was attempted to be synthesized in 1972 by shooting Zirconium-66 and 68 at Uranium-238. It was unsuccessful and no atoms were detected. Unbibium is predicted to be in the island of stability.

### Unbitrium
Unbitrium also known as eka-protactinium, or element-123. No attempt has ever been made to make Unbitrium.

### Unbiquadium
Unbiquadium, also known as eka-uranium, is the predicted element-124. It is predicted that Unbiquadium-308 has a magic number of neutrons, 184. It is in the island of stability.

### Unbipentium
Unbipentium also known as eka-neptunium, is the predicted element-125. In 1977, Unbipentium was tried to be synthesized by shooting zinc-68 and 68 at americium-238. It was unsuccessful and no atoms were detected. 

### Unbihexium
Unbihexium also known as eka-plutonium is expected to have a magic number of protons and neutrons 126 protons and 184 neutrons.
There was a synthesization attempt in 1971, however it was unsuccessful. It is in the island of stability.

### Unbiseptium
Unbiseptium, also known as eka-americium, was attempted to be synthesized in 1978 by shooting xenon ions at tantalum. No atoms were detected.

### Unbioctium
Unbioctium also known as eka-curium, is the predicted element-128, it has not been tried to be synthesized.

### Unbiennium
Unbiennium also known as element-129, has not yet been tried to be synthesized.

### Untrinilium
Untrinilium, also known as element-130, isotopes that are above Untrinilium are predicted to have isotopes that are extremely radioactive. It has never been tried to be synthesized.

### Untriunium
Untriunium, also known as eka-Einsteinium is element-131 of the periodic table. It has not yet been tried to be synthesized.

### Untribium
Untribium also known as eka-Rutherfordium is element-132 It is predicted to be in the island of stability.

### Untritrium
Untritrium, also known as element-133 has the atomic symbol Utt it is expected to have extremely unstable isotopes. It has not yet been tried to be synthesized.

### Untriquadium
Untriquadium, also known as element-134 is in the island of stability. It has not yet been tried to be synthesized.

### Untripentium
Untripentium, also known as element-135 has atomic symbol Utp. It has not yet been tried to be synthesized.

### Untrihexium
Untrihexium, also known as element-136 has not been tried to be synthesized. It has atomic symbol Uth.

### Untriseptium
Untriseptium also called eka-dubnium is predicted to be element-137. Richard Feynman said that Untriseptium located at the end of the periodic table. He was wrong. It turned out to be Unsepttrium. and there have not been any attempts to make Untriseptium. 

### Untrioctium
Untrioctium, also known as element-138, has not yet been tried to be synthesized. It has atomic symbol Uto.

### Untriennium
Untriennium is element-139. It has not yet been tried to be synthesized. It has atomic symbol Ute.

### Unquadnilium
Unquadnilium is element-140. It has not yet been tried to be synthesized. It has atomic symbol Uqn.

### Unquadunium
Unquadunium is element-141 of the periodic table. It has not yet been tried to be synthesized, with the atomic symbol Uqu.

### Unquadbium
Unquadbium, is the predicted element-142. It is predicted to have extremely radioactive Isotopes. It has not yet been tried to be synthesized. It has atomic symbol Uqb.

### Unquadtrium
Unquadtrium, is the predicted element-143. It is predicted to have extremely radioactive Isotopes. It has never been tried to be synthesized. It has atomic symbol Uqt.

### Unquadquadium
Unquadquadium, is the predicted element-144. It has never been tried to be synthesized. It has atomic symbol Uqq.

### Unquadpentium
Unquadpentium, is the predicted element-145. It has never been tried to be synthesized.

### Unquadhexium
Unquadhxium, is the predicted element-146. It has never been tried to be synthesized. It has atomic symbol Uqh.

### Unquadseptium
Unquadseptium, is the predicted element-147. It has never been tried to be synthesized. It has atomic symbol Uqs.

### Unquadoctium
Unquadoctium, is the predicted element-148. It has never been tried to be synthesized. It has atomic symbol Uqo.

### Unquadennium
Unquadennium, is the predicted element-149. It has never been tried to be synthesized. It has atomic symbol Uqe.

### Unpentnilium
Unpentnilium, is the 150th element of the periodic table. It has not yet been tried to be synthesized.

### Unpentunium
Unpentunium, is the 151st element of the periodic table. It has not yet been tried to be synthesized. 

### Unpentbium
Unpentbium, is the 152nd element of the periodic table. It has not yet been tried to be synthesized.

### Unpentrium
Unpentrium, is the 153th element of the periodic table. It has not yet been tried to be synthesized.

### Unpentquadium
Unpentquadium, is the 154th element of the periodic table. It has not yet been tried to be synthesized.

### Unpentpentium
Unpentpentium, is the 155th element of the periodic table. It has not yet been tried to be synthesized.

### Unpenthexium
Unpenthexium is the predicted element-156. It has not yet been tried to be synthesized.

### Unpentseptium
Unpentseptium is the last element in the superactinides. It is the predicted element-157. It has not yet been tried to be synthesized.
 
## Nuclides after element-120
### Alpha decay chain
There is a alpha decay chain starting from 296-Uue,296 and 299-Ubn, 300-Ubu, 300 and 303-Ubb, 304-Ubt, and 304-Ubq continuing up a possible narrow 1 microsecond alpha decay chain. with targets 248-Cm 249-Bk and 249-Cf and projectiles 50-Ti 54-Cr and 58-Fe.
 
### Isotopes of Unbiunium
A calculation in 2016 predicted that the most stable predicted isotopes of Unbiunium are 309-314 Ubu. They are predicted to have half-lives long enough to be detected in labs. 304-314 Ubu though are expected to alpha decay.

### Isotopes of Unbibium
There were two attempts of making Ubb-306 they were tried to be made by shooting 58-Fe at 248-Cm. No atoms were found. The 2nd one was shooting 64-Ni at 242-Pu. Again, no atoms were found. 

### Isotopes of Unbiquadium
The predicted most stable isotope of Unbiquadium is predicted to be Ubq-330. with 124 protons and 206 neutrons. Ubq-308 has a magic number of neutrons which is 184.

### Isotopes of Unbihexium
The predicted Ubh-310 expected to be the longest living isotope of Unbihexium. It has a magic number of protons and neutrons. 126 protons, and 184 neutrons.

## References