Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
Deuterium is an isotope of hydrogen with one proton and one neutron in its nucleus. It is also known as heavy hydrogen due to its greater mass compared to protium, the most common hydrogen isotope.
5 Must Know Facts For Your Next Test
Deuterium played a crucial role in the nucleosynthesis processes that occurred during the first few minutes after the Big Bang.
It is less abundant than regular hydrogen but still found in significant amounts in the universe.
Deuterium is created through nuclear fusion reactions within stars and was also produced during the Big Bang.
The presence and ratio of deuterium in celestial bodies can provide insights into the conditions of the early universe.
Deuterium's abundance helps scientists understand baryon density and other cosmological parameters.
The production of nuclei other than those of H-1 (hydrogen) during the early phases of the universe's development, primarily responsible for creating light elements like helium, deuterium, and lithium.