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Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules |
Atomic number, 1, Relative atomic mass, 1.008 ; State at 20°C, Gas, Key isotopes · H, 2H ; Electron configuration, 1s · CAS number, 133-74-0. |
Name, Hydrogen ; Symbol, H ; Atomic Number, 1 ; Atomic Mass, 1.00794 atomic mass units ; Number of Protons, 1. |
The atomic number is equal to the number of protons in an atom's nucleus. Hydrogen's atomic number is 1 because all hydrogen atoms contain exactly one proton. |
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