It is iron.
The heaviest element that can be produced in the core of a massive star before it goes supernova is iron. Iron does not cause the death of a red giant, but rather the inability to continue nuclear fusion in its core, leading to its collapse and eventual explosion as a supernova.
Nuclear fusion stops and the star is no longer capable of transformming LIGHTER elements into HEAVIER. elements. At this point GRAVITY looses out and PRESSURE wins out thereby causing the supernova explosion. But bear in mind, there is a HUGE difference between an ordinary star going NOVA and a SUPERNOVA.
The heaviest element that can be produced prior to supernova is Iron (Fe).
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A supernova *is* the explosion. A super nova is caused by one of a few stellar events: A) Sudden collapse of a star, which causes massive carbon fusion. B) The gradual accumulation of material by an already collapsed star until the mass is enough to compress the core of the star and start fusion of the element carbon (normal stars fuse hydrogen)
A supernova occurs when a massive star reaches the end of its life cycle and undergoes a catastrophic explosion. This explosion can outshine an entire galaxy for a brief period of time before fading away.
Before a supernova occurs, a massive star undergoes fusion to produce iron in its core. As fusion progresses, the star creates heavier elements up to iron, which cannot release energy through fusion. When the core becomes predominantly iron, it can no longer support the star against gravitational collapse, leading to a supernova explosion.
Elements present in a star just before it forms a supernova would include hydrogen, helium, carbon, oxygen, and iron. The star undergoes nuclear fusion to produce heavier elements in its core, leading to the buildup of iron which triggers the supernova explosion.
A "guest" star is the name for the original star, before it exploded as a Supernova. Because the Supernova is the explosion and has no real physical relation to the Star, it is termed "guest" star.
Platinium is created within the massive explosion of a supernova. It is one of the last things to be produced when a giant star goes supernova, therefore not a lot of it can be produced in time before the star blasts itself apart.
A star must have at least 8 times the mass of the Sun in order to undergo a supernova explosion at the end of its life cycle. This is because stars need to have enough mass to generate the tremendous pressure and temperature required for a supernova to occur.
Well friend, after a star goes supernova, the last element that forms in its core is usually iron, a true star of the show! As the star expands and contracts in its final moments, different elements fuse together until only iron remains. It's all part of nature's beautiful dance, showing us the wonder and complexity of the universe.