What is the atomic number characterizing hydrogen on the periodic table?
Answer
One
Hydrogen is defined by its simplicity, which dictates its placement as the very first element. Its defining characteristic is its atomic number, which corresponds precisely to the number of protons in its nucleus. Since the foundational hydrogen atom consists of just one proton, its atomic number is one. This makes it the lightest element known. This atomic number of one is the key factor that establishes its unique place as the elemental starting point from which all heavier elements are subsequently derived through stellar nucleosynthesis.
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