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By mass, hydrogen = 75%, helium = 23%.

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7y ago

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What are the two lightest gases in the universe?

In our known universe, hydrogen then helium. But this may change with further exploration.


What temperature did the Universe have when hydrogen and helium formed?

When hydrogen and helium atoms first formed in the universe, the temperature ranged from about 3000 to 4000 Kelvin. This temperature allowed protons and electrons to combine to form neutral hydrogen atoms, a process known as recombination. Subsequently, the universe became transparent to radiation for the first time.


What element is the most abundant in the world?

Hydrogen is the most abundant element in the known Universe; helium is second.


What is the most abundant inorganic element in the world?

Hydrogen is the most abundant element in the known Universe; helium is second.


99 percent of the known matter in the universe?

is found in the form of hydrogen and helium. These elements were created during the Big Bang, and all other elements found in the universe were formed through processes like nuclear fusion in stars. Only a small fraction of the universe is made up of heavier elements like carbon, oxygen, and iron.


What chemical element is the primary constitutent of a young star?

In the current stage of the Universe, stars start off with lots of hydrogen-1 - and that's what they first fuse, since fusing heavier elements requires higher temperatures.Actually, hydrogen-2 (also known as deuterium) is even easier to fuse, but stars don't have significant amounts of that.


Can helium be turned into hydrogen to produce energy?

Helium cannot be turned into hydrogen to produce energy. Helium and hydrogen are two different elements with different atomic structures and properties. However, fusion reactions involving hydrogen isotopes such as deuterium and tritium can produce energy in a process known as nuclear fusion.


What gas is exchanged into helium in a stars nuclear reactions?

In a star's nuclear reactions, hydrogen is converted into helium. This process, known as nuclear fusion, occurs in the core of a star, where high temperatures and pressures cause hydrogen atoms to combine to form helium.


What fusion in stars occurs to create the element helium?

Hydrogen fusion occurs in stars to create helium. This process, known as nuclear fusion, involves the fusion of hydrogen nuclei to form helium nuclei, releasing large amounts of energy in the process.


Do hydrogen and helium make the sun?

Yes. Well, actually, it isn't entirely made of hydrogen and helium. It's also made of carbon-based substances and methane gas. The hydrogen burning into helium is what makes the star bright. This is also known as luminosity. Which is how bright something is.


What is the lightest element in the universe?

Hydrogen is the lightest element in the universe, with a single proton and one electron in its nucleus.


Is the sun liqid?

no, it's a constant explosion by gases known as helium, hydrogen. it is a fire, not a liquid.