How did hydrogen and helium atoms start in stars?

All of the atoms in the universe began as hydrogen. Fusion inside stars transforms hydrogen into helium, heat, and radiation. Heavier elements are created in different types of stars as they die or explode.

How did helium form in the universe?

Helium is an element, usually in the form of a gas, that consists of a nucleus of two protons and two neutrons surrounded by two electrons. Most of the helium in the universe was created in the Big Bang, but it also is the product of hydrogen fusion in stars.

What is the first atom that was created in the universe?

helium
It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the first atoms. These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe.

When did atoms first appear in the universe?

380,000 years
As the universe continued to expand and cool, things began to happen more slowly. It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the first atoms. These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe.

Why is hydrogen abundance in the universe?

Why is hydrogen the most abundant element in the universe? Hydrogen has one proton, one electron and is the only element with no neutrons, making it the simplest element in the universe. Because of this, Hydrogen is believed to be the most abundant element, accounting for about 90\% of the visible universe.

How is hydrogen formed in the universe?

Hydrogen didn’t appear until the universe had spread out — and subsequently cooled — enough for the first protons and neutrons, and later simple atoms, to form. Within about 3 minutes after the Big Bang, conditions cooled enough for these protons and neutrons to form hydrogen nuclei.

How much hydrogen is in the universe?

Hydrogen and helium are estimated to make up roughly 74\% and 24\% of all baryonic matter in the universe respectively….Universe.

Z	Element	Mass fraction (ppm)
1	Hydrogen	739,000
2	Helium	240,000
8	Oxygen	10,400
6	Carbon	4,600