Mostly heavy elements are created inside stars and then spread when they go supernova and recondense into new stars and planets.
The Big Bang created over 99.9% of the atoms in the current universe, but these are limited to Hydrogen and a little bit of Helium.Stellar fusion created most of the Helium and the elements from Lithium through Nickel and Iron.Supernova explosions created all the rest of the elements, including quite a few transuranic elements.
According to the current theories of the origin of the universe, pretty much all matter at the birth of the universe was in the form of hydrogen. The hydrogen then coalesced into stars where the Hydrogen was fused into heavier atoms. The heavy atoms accumulated in the core of the early stars until they went nova and spewed all that stuff out into interstellar space. After lots of time, new star systems developed, and some of the matter in them consisted of those heavy elements from earlier supernovas. Basically, all elements heavier than hydrogen were belched out by long-gone stars. You are composed of stardust.
Most of the atoms in living things come from just six elements. These elements are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Scientists theorize that these elements, along with all 93 natural elements, were created in the centers of stars billions of years ago, shortly after the universe formed in a violent explosion.
Atoms, elements, and other compounds result from chemical processes and reactions, such as the sun continuously create hydrogen from helium and vice-versa. Here on Earth, the burning of methane gas produces carbon dioxide and hydrogen. Regardless of the reaction and the resulting atoms, elements and compounds, all the mass in the universe is constant. In our universe, it is believed that all the elements resulted from the "Big Bang", the point at which the universe as we know it began. About 15 billion years ago or so, all the matter in our universe was presumably contained in a single particle of infinite density, no bigger the size of a single atom, that exploded, releasing all the mass in the universe. Our universe is still expanding, but its mass remains constant.
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