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Big Bang nucleosynthesis

In physical cosmology, Big Bang nucleosynthesis (also known as primordial nucleosynthesis, and abbreviated as BBN) is the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the universe. This type of nucleosynthesis is thought by most cosmologists to have occurred from 10 seconds to 20 minutes after the Big Bang.

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Carbon

Carbon is a chemical element with the symbol C and atomic number 6.

Helium

Helium is a chemical element with the symbol He and atomic number 2.

Helium-3

Helium-3 is a light, non-radioactive isotope of helium, consisting of two protons and one neutron.

Helium-4

Helium-4 is a stable isotope of the element helium.

Hydrogen

Hydrogen is a chemical element with the symbol H and atomic number 1.

Isotope

An isotope is a variant form of a chemical element that has the same number of protons but a different number of neutrons, giving it a different atomic mass.

Lithium

Lithium is a chemical element with the symbol Li and atomic number 3.

Neutrino

Neutrinos are subatomic particles that are neutral in charge and have an extremely small mass.