How were the heavy elements from iron to uranium made?
Asked by Raj Kumar Last Modified
Follow 0 
Answer 
They are released in supernovae, but are made over the life of a star, over many millions and billions of years. The gravitational pressure of a star is so great that it compresses the gasses in its interior to a point that the atoms break down into a plasma state. The atomic nuclei lose their orbiting...
read more They are released in supernovae, but are made over the life of a star, over many millions and billions of years. The gravitational pressure of a star is so great that it compresses the gasses in its interior to a point that the atoms break down into a plasma state. The atomic nuclei lose their orbiting electrons into a disassociated soup of particles and groups of particles. The nuclei are forced so close together they sometimes fuse into large nuclei, such as Uranium or other heavy atoms. That is atomic fusion. It releases a tremendous amount of energy and it is what powers stars like our sun. Those nuclei which are inherently unstable break down quickly. Those which are stable may survive in the star until it explodes in a nova or supernova and the heavy elements are released into the nebula. Once the elements are in the nebula, they can condense and coalesce into new planets, stars, and other solar system bodies. Our own solar system is probably a third-generation system, with material from the previous generations stars distributed in the planets, asteroids, and icy objects. We are made of the stuff of dead stars; we are stardust. read less
1
Comments
Mazespace .
In supernova explosions.
0
Comments
Mazespace .
They are not made in supernovae. They are released in supernovae, but are made over the life of a star, over many millions and billions of years. The gravitational pressure of a star is so great that it compresses the gasses in its interior to a point that the atoms break down into a plasma state....
read more They are not made in supernovae. They are released in supernovae, but are made over the life of a star, over many millions and billions of years. The gravitational pressure of a star is so great that it compresses the gasses in its interior to a point that the atoms break down into a plasma state. The atomic nuclei lose their orbiting electrons into a disassociated soup of particles and groups of particles. The nuclei are forced so close together they sometimes fuse into large nuclei, such as Uranium or other heavy atoms. That is atomic fusion. It releases a tremendous amount of energy and it is what powers stars like our sun. Those nuclei which are inherently unstable break down quickly. Those which are stable may survive in the star until it explodes in a nova or supernova and the heavy elements are released into the nebula. Once the elements are in the nebula, they can condense and coalesce into new planets, stars, and other solar system bodies. Our own solar system is probably a third-generation system, with material from the previous generations stars distributed in the planets, asteroids, and icy objects. We are made of the stuff of dead stars; we are stardust. read less
0
Comments
Mazespace .
The two main contributions are thought to be from the s-process and the r-process, which are both neutron capture processes that are differentiated by their speed relative beta-decay of neutron rich isotopes. Both are end-of-stellar-life processes with the S-process probably happening in the giant...
read more The two main contributions are thought to be from the s-process and the r-process, which are both neutron capture processes that are differentiated by their speed relative beta-decay of neutron rich isotopes. Both are end-of-stellar-life processes with the S-process probably happening in the giant stages of very heavy stars and the r-process probably happening in core-collapse supernovas. read less
0
Comments
Mazespace .
Unlike light elements, which release energy during fusion, elements heavier than iron require energy for their creation. This happens because the nuclear binding energy is at its maximum at iron. Hence lighter elements were made in ordinary stars, using fusion. However, heavier elements were made in...
read more Unlike light elements, which release energy during fusion, elements heavier than iron require energy for their creation. This happens because the nuclear binding energy is at its maximum at iron. Hence lighter elements were made in ordinary stars, using fusion. However, heavier elements were made in supernovas, as huge amounts of extra energy are released during the explosion, some of which is used to force heavy nuclei together and create heavier elements. read less
0
Comments
Mazespace .
n novas and supernovas. Collapsing stars are the only objects with enough pressure and energy to fuse heavy atomic nuclei and release them back into space.
0
Comments
Both dark matter and possibly dark energy originate from the earliest days of the universe, when light elements such as helium and lithium arose. Heavier elements formed later inside stars, where nuclear reactions jammed protons and neutrons together to make new atomic nuclei. For instance, four hydrogen...
read more Both dark matter and possibly dark energy originate from the earliest days of the universe, when light elements such as helium and lithium arose. Heavier elements formed later inside stars, where nuclear reactions jammed protons and neutrons together to make new atomic nuclei. For instance, four hydrogen nuclei (one proton each) fuse through a series of reactions into a helium nucleus (two protons and two neutrons). That's what happens in our sun, and it produces the energy that warms Earth. But when fusion creates elements that are heavier than iron, it requires an excess of neutrons. Therefore, astronomers assume that heavier atoms are minted in supernova explosions, where there is a ready supply of neutrons, although the specifics of how this happens are unknown. More recently, some scientists have speculated that at least some of the heaviest elements, such as gold and lead, are formed in even more powerful blasts that occur when two neutron stars—tiny, burned-out stellar corpses—collide and collapse into a black hole. read less
0
Comments
U can get info in this link http://www.as.utexas.edu/~chris/halostars.html
0
Comments
View 12 more Answers
Related Questions
7 How to give perfect demo class? Which subject should teach for demo class? Ex. I went to give a demo class for x student 
Hi Mr. Naveen. From my experience, I can tell that if you are giving demo class to your students, make it serious matter cause the class session itself will give the opportunity for future further...
I am not intrested in my study, so what I can do to get intrested in my study?
Shabeer, human mind is tuned and gets addicted to, what we keep doing. So, better hire a good trainer/ tutor, who helps you, to understand the subject better and slowly, you'll get interest in the subject. wish you good luck in studies.
What is the difference between ac generator and dc ganerator
The AC generator, or more properly, alternator, produces an output voltage that varies both in amplitude and time. In America and some places in Europe as well as one part of Japan, the frequency is 60...
The equation of a current is given by i = Imsin2?t. The frequency of the current in Hz is a.) ? ? 2?. b.) ? ? 2. c.) 2? ? ?. d.) ? ? ?.
Kindly re-post the question without the question mark symbols.
Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com
Ask a QuestionRelated Lessons
Introduction To Accounting: Part 15: Cost Concept Or Historical Cost Concept
According to the Cost Concept, an asset is recorded in the books of account at the price paid to acquire it and the cost is the basis for all subsequent accounting of the asset. Since the acquisition...
Various Methods of Depreciation
Dear students,Depreciation refers to a phenomenon where the value of a fixed asset falls year on year. This change is due to obsolescence in technology, efflux of time and wear and tear of the fixed asset...
Effective learning
Dear all, Are you one of them who try to learn their lessons continuously for more than an hour? Do you get bored? Are you not able concentrate after some time? Not able to remember what you have learnt?...
Accounting for partnership: Basic concept
QUESTIONS: Define Partnership Deed. Answer: A partnership deed is an agreement among the partners which contains ai! the terms of the Partnership. It generally contains the details about all the...
Introduction to Trial Balance & its Components
Aims And Objectives At the end of the lesson you be able to: Understand of Sundry Debtors Understanding of Sundry Creditors Understanding of Basics of Trial balance Introduction All...
Recommended Articles
Meet Radhe Shyam Burman, an MBA Tutor from...
Radhe Shyam is a highly skilled accounts and finance trainer with 8 years of experience in teaching. Accounting is challenging for many students and that’s where Radhe Shyam’s expertise comes into play. He helps his students not only in understanding the subject but also advises them on how to overcome the fear of accounts...
Read full article >
Meet Swati, a Hindi Tutor from Bangalore
Swati is a renowned Hindi tutor with 7 years of experience in teaching. She conducts classes for various students ranging from class 6- class 12 and also BA students. Having pursued her education at Madras University where she did her Masters in Hindi, Swati knows her way around students. She believes that each student...
Read full article >
Meet Sandhya R, a B.Sc tutor from Bangalore
Sandhya is a proactive educationalist. She conducts classes for CBSE, PUC, ICSE, I.B. and IGCSE. Having a 6-year experience in teaching, she connects with her students and provides tutoring as per their understanding. She mentors her students personally and strives them to achieve their goals with ease. Being an enthusiastic...
Read full article >
Meet Raghunandan.G.H, a B. Tech Tutor from...
Raghunandan is a passionate teacher with a decade of teaching experience. Being a skilled trainer with extensive knowledge, he provides high-quality BTech, Class 10 and Class 12 tuition classes. His methods of teaching with real-time examples makes difficult topics simple to understand. He explains every concept in-detail...
Read full article >
Find Class 12 Tuition near you
Looking for Class 12 Tuition ?
Learn from the Best Tutors on UrbanPro
Are you a Tutor or Training Institute?
Join UrbanPro Today to find students near you
