Hydrogen is a chemical element. It has the symbol H and atomic number 1. It has a standard atomic weight of 1.008, meaning it is the lightest element in the periodic table.
Hydrogen is the most common chemical element in the Universe, making up 75% of all normal (baryonic) matter (by mass). Most stars are mostly hydrogen. Hydrogen's most common isotope has one proton with one electron orbiting around it.
A: The symbol for Hydrogen is H.
A: The atomic number of Hydrogen is 1.
A: The standard atomic weight of Hydrogen is 1.008, making it the lightest element in the periodic table.
A: Hydrogen makes up 75% of all normal (baryonic) matter (by mass).
A: Yes, hydrogen is the most common chemical element in the Universe.
A: Hydrogen's most common isotope has one proton with one electron orbiting around it.
A: Yes, most stars are mostly composed of hydrogen.
