According to the work of Truran and Cameron, and of others, on the chemical evolution of the Galaxy, the first generation of stars in the Galaxy contained principally massive objects. If big-bang nucleosynthesis was responsible for the formation of helium, the first generation of stars would ...
1.(Elements & Compounds) an ionized hydrogen atom, occurring in plasmas and in aqueous solutions of acids, in which it is solvated by one or more water molecules; proton. Formula: H+ 2.(Elements & Compounds) an ionized hydrogen molecule; hydrogen molecular ion. Formula: H2+ ...
Hydrogen is the most abundant element in the cosmos. The reason is simple. Its nucleus was already made a second after the Big Bang, when the early Universe was filled with a hot soup of protons and neutrons. Composite nuclei like helium or heavier e... hydrogen Big BangCould...
Protons and neutrons appeared one second after the Big Bang. Pairs of protons and neutrons combined to form deuterium nuclei. These fused to create helium nuclei. But the abundance of protons relative to neutrons meant that single protons (hydrogen nuclei) outnumbered helium nuclei. This meant ...
"That's when the light-blocking fog of charged subatomic particles generated in the universe's first few moments finally cooled enough for neutral hydrogen and helium atoms to form, thus rendering the universe transparent to photons long trapped in limbo." Cosmic outlook So, it is not necessaril...
The Big Bang created the universe 13.7 billion years ago. The universe is brimming with hydrogen, and the beautiful night sky is formed by hydrogen fusion. Here, the fusion is a nuclear reaction creating nuclei such as helium through reactions between light nuclei such as hydrogen. The Sun is...
Helium is preferable for use in lighter-than-air craft since it is not flammable. Hydrogen is used in the Haber process for the fixation of atmospheric nitrogen, in the production of methanol, and in hydrogenation of fats and oils. It is also important in low-temperature research. It can ...
thermonuclear bomb, also called hydrogen bomb, or H-bomb, weapon whose enormous explosive power results froman uncontrolled self-sustaining chain reaction in which isotopes of hydrogen combine under extremely high temperatures to form heliumin a process known as nuclear fusion. ...
H is known as tritium and contains one proton and two neutrons in its nucleus. It is radioactive, decaying into helium-3 through beta decay with a half-life of 12.32 years.[50] It is so radioactive that it can be used in luminous paint to enhance the visibility of data displays, such...
Oxygen is Earth's most abundant element, and after hydrogen and helium, it is the third-most abundant element in the universe. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O 2. Diatomic oxygen ...