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They were formed in supernovae.
All the compounds existing in the universe are formed.
According to the classical Big Bang hypothesis, heavy elements were formed through nucleosynthesis in the cores of massive stars through fusion reactions. These heavy elements were then distributed into the universe through processes like stellar explosions (supernovae) and neutron star mergers. This helped enrich interstellar gas clouds with heavy elements, which later formed into new stars and planetary systems.
Uranium is formed through the process of supernovae, where heavy elements are created by nuclear reactions in the hot, dense cores of dying stars. These heavy elements are then scattered into space when the star explodes, eventually forming into uranium-rich mineral deposits on Earth through geological processes.
Now the periodic table is limited to 118 elements.