Which element has the atomic number 1?

Hydrogen is the element with the atomic number 1, which means it has one proton in its nucleus. The atomic number is a unique identifier for elements, reflecting the number of protons, which determines the element's properties and its place in the periodic table. Hydrogen is the simplest and most abundant element in the universe, playing a crucial role in the formation of stars and many chemical processes, including the formation of water when it combines with oxygen.

In contrast, oxygen has an atomic number of 8, carbon has an atomic number of 6, and helium has an atomic number of 2. Each of these elements has more protons in their nuclei compared to hydrogen, distinguishing them clearly in terms of chemical characteristics and behavior.