k .. how are elements formed in stars?

i have exam tomorrow ..and i need th annswer!!! THANKS

The gas from which they formed had been seeded with the heavy elements formed from previous giant stars. Nucleosynthesis--wikipedia

To understand how elements are formed in stars, we need to look at a process called stellar nucleosynthesis. Here is an explanation to help you answer this question for your exam:

Stars are massive structures composed mainly of hydrogen gas. Through the process of nuclear fusion, stars convert hydrogen into helium in their cores. This fusion reaction releases an enormous amount of energy in the form of light and heat, which is what makes stars shine.

As the life cycle of a star progresses, its core eventually runs out of hydrogen fuel. At this point, the star undergoes further fusion reactions to sustain its energy production. These reactions involve heavier elements such as helium, carbon, oxygen, and so on. The fusion reactions in the core of a star occur under extreme temperatures and pressures, allowing atoms to collide and fuse together.

The process of fusion releases more energy, which keeps the star from collapsing under its own gravity. As fusion continues, heavier and heavier elements are formed, including elements like nitrogen, silicon, iron, and beyond. The specific elements produced depend on the mass of the star and the temperature and pressure inside its core.

When a massive star reaches the end of its life cycle, it undergoes a powerful explosion called a supernova. This explosion disperses the elements formed within the star into space, enriching the surrounding interstellar medium with heavier elements. These elements are then available to form new stars, planets, and other celestial bodies.

In summary, elements are formed in stars through the process of nuclear fusion, starting with the fusion of hydrogen into helium. The fusion reactions continue and produce progressively heavier elements as the star evolves, until the star ultimately explodes as a supernova and disperses its enriched material into space. This material becomes the building blocks for future stars and planetary systems.