PSI Barbering Practice Exam

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What is the most common element found in the universe?

Carbon
Nitrogen
Oxygen
Hydrogen

The correct answer is: Hydrogen

Hydrogen is the most common element found in the universe, making up about 75% of its elemental mass. This is largely due to the processes that occurred during the Big Bang, which led to the formation of simple hydrogen atoms. Hydrogen's abundance is also reflected in its role as the primary fuel for stars, including our Sun, where it undergoes fusion to form helium and release energy. The other elements, while critical for life and various processes, occur in much smaller quantities in the cosmos. Carbon, nitrogen, and oxygen are essential for life on Earth and can be found in stars and the interstellar medium, but they make up a significantly smaller portion of the universe compared to hydrogen. This fundamental understanding of elemental abundance is important in fields such as astrophysics and cosmology.