Because no rational process can make them. I've been over the tables, and there are only a couple of possible reactions to get there for any nuclei, and they require two rare ones. Alpha particle capture just isn't going to cut it. Look at the curve; you need more neutrons.

We remember that all elements heavier than iron have their primary source as supernovae. You don't get much chance of a concentrating event of certain elements and try again. Yeah sure you could have a planet collide with a giant star a few hours before said supernova; however consider the odds of getting the result of that exceedingly rare event (consider the timescale) in the gasses required to form our own solar system.

One of the Plutoniums (244) has enough half life long enough to last until it gets here, and it's not found that way either, but by direct production in Uranium ores.

So no, not expected at all.

EDIT: Other linked questions give pathways involving neutron star collisions; this does not change the essential position one bit as the same lack of chemical enriching processes is present in such beasts so the rare cases are still rare.

Because no rational process can make them. I've been over the tables, and there are only a couple of possible reactions to get there for any nuclei, and they require two rare ones. Alpha particle capture just isn't going to cut it. Look at the curve; you need more neutrons.

We remember that all elements heavier than iron have primary sources as neutron star collisions and supernovae. The s-process stops around lead or gold (depending on who you ask) leaving the r-process to extend to higher levels. However, the r-process itself is only so rapid and must be bounded by the nuclear decay rates themselves. In order to reach the island of stability by the r process, it would be necessary to pass through the boundary layer around element 109 where several isotopes must be passed through in a row that possess half lives measured in seconds to milliseconds. However my tables show it doesn't even get here but caps out at Neptunium*. Either way, this leaves induced fusion as the only possible pathway.

Unfortunately the induced fusion reactions require rare nuclei. You don't get much chance of a concentrating event of certain elements and try again. Yeah sure you could have a planet collide with a giant star a few hours before said supernova; however consider the odds of getting the result of that exceedingly rare event (consider the timescale) in the gasses required to form our own solar system.

So no, not expected at all.

*One of the Plutoniums (244) has enough half life long enough to last until it gets here, and it's not found that way either, but by direct production in Uranium ores.

Because no rational process can make them. I've been over the tables, and there are only a couple of possible reactions to get there for any nuclei, and they require two rare ones. Alpha particle capture just isn't going to cut it. Look at the curve; you need more neutrons.

We remember that all elements heavier than iron have their primary source as supernovae. You don't get much chance of a concentrating event of certain elements and try again. Yeah sure you could have a planet collide with a giant star a few hours before said supernova; however consider the odds of getting the result of that exceedingly rare event (consider the timescale) in the gasses required to form our own solar system.

One of the Plutoniums (244) has enough half life long enough to last until it gets here, and it's not found that way either, but by direct production in Uranium ores.

So no, not expected at all.

Because no rational process can make them. I've been over the tables, and there are only a couple of possible reactions to get there for any nuclei, and they require two rare ones. Alpha particle capture just isn't going to cut it. Look at the curve; you need more neutrons.

We remember that all elements heavier than iron have their primary source as supernovae. You don't get much chance of a concentrating event of certain elements and try again. Yeah sure you could have a planet collide with a giant star a few hours before said supernova; however consider the odds of getting the result of that exceedingly rare event (consider the timescale) in the gasses required to form our own solar system.

One of the Plutoniums (244) has enough half life long enough to last until it gets here, and it's not found that way either, but by direct production in Uranium ores.

So no, not expected at all.

EDIT: Other linked questions give pathways involving neutron star collisions; this does not change the essential position one bit as the same lack of chemical enriching processes is present in such beasts so the rare cases are still rare.