Q. How does hydrogen combine to form helium?
From hydrogen to helium in three steps In the first stage two protons combine and one of them converts into a neutron to form a nucleus of the heavy isotope of hydrogen known as deuterium. Next, the deuterium nucleus combines with another proton to form the light helium isotope known as helium-3.
Q. What happens when hydrogen nuclei fuse into helium nuclei?
– When the temperature and pressure become high enough, the hydrogen nuclei fuse into helium nuclei, releasing large amounts of energy. – Hydrogen nuclei fuse to produce helium nuclei, releasing energy in the process. – The bigger the star, the hotter its core, so it can create heavier elements by fusion.
Q. What is it called when hydrogen atoms condense to make helium?
Introduction: Fusion is the process that powers the sun and the stars. In one example of this type of reaction, two atoms of hydrogen combine together to form an atom of helium. In the process, some of the mass of the hydrogen is converted into energy.
Q. How much energy is released in a fusion reaction?
With current technology, the reaction most readily feasible is between the nuclei of the two heavy forms (isotopes) of hydrogen – deuterium (D) and tritium (T). Each D-T fusion event releases 17.6 MeV (2.8 x 10-12 joule, compared with 200 MeV for a U-235 fission and 3-4 MeV for D-D fusion).
Q. What do two helium atoms make?
Two helium-3 atoms combine to form beryllium-6, which is unstable.
Q. What star has an outer shell of burning hydrogen and a core of helium?
HB stars
Q. Why is lithium so rare?
Astronomical. Although it was synthesized in the Big Bang, lithium (together with beryllium and boron) is markedly less abundant in the universe than other elements. This is a result of the comparatively low stellar temperatures necessary to destroy lithium, along with a lack of common processes to produce it.
Q. Why is oxygen so common in the universe?
Why is oxygen the third most common element in the universe? – Quora. tl;dr – Oxygen nucleus is very stable so that it is an end product of stellar nucleosynthesis, and light enough so that it can be formed in most stars.
Q. Is Lithium the third most common element?
For a very brief amount of time, carbon takes over for lithium as the third most common element in the Universe, but it doesn’t last. Helium fuses into carbon, then at higher temperatures (and later times), carbon fuses into oxygen, oxygen fuses into silicon and sulphur, and silicon finally fuses into iron.
Q. Why are lithium beryllium and boron so rare?
Lithium, beryllium and boron are rare because although they are produced by nuclear fusion, they are then destroyed by other reactions in the stars. The elements from carbon to iron are relatively more abundant in the universe because of the ease of making them in supernova nucleosynthesis.
Q. What is the oldest animal on earth?
What is the oldest living thing on Earth?
- The oldest living land animal is a 187-year-old Aldabra giant tortoise named Jonathan.
- If you’re looking for something warm blooded, the oldest known mammal is the bowhead whale, with one individual estimated to be 211 years old.
Q. What is the most expensive thing in the universe?
16 Psyche
Q. What is the most expensive thing ever sold at auction?
The world’s most expensive work of art sold at auction is a 500-year-old painting of Christ believed to have been painted by Leonardo da Vinci. The painting, which is known as Salvator Mundi (Saviour of the World), sold at Christie’s in New York for a record $450m (£341m) in 2017.
Q. What is the most expensive city in the world?
(CNN) — Ashgabat in Turkmenistan is the most expensive city in the world for overseas workers, according to this year’s Mercer Cost of Living Survey.
