What is the drawback of using hydrogen as atomic mass unit?
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Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element in the periodic table. At standard conditions hydrogen is a gas of diatomic molecules having the formula H2. It is colorless, odorless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal
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Simply because one atom of hydrogen has only 1 proton (and no neutrons) in the nucleus, and correspondingly only one electron. So it's Relative Atomic Mass is 1. Hydrogen gas, which is the form that occurs naturally, consists of diatomic molecules ands so has a Relative MOLECULAR Mass of 2.
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