We now know that a hydrogen atom has a mass of 1.6735 x 10-24 grams, and that the oxygen atom has a mass of 2.6561 X 10-23 grams. As we saw earlier, it is convenient to use a reference unit when dealing with such small numbers: the atomic mass unit.

How much does a hydrogen atom weigh in kg?

Answer: Ans. 6.023×10^23 atoms of Hydrogen weigh 1.008 g. So, 1 atom of Hydrogen weighs 1.008/(6.023×10^23) g = 0.167×10^(-23) g = 1.67×10^(-27) kg .

How much does a hydrogen electron weigh?

Hydrogen atomic orbitals at different energy levels. The more opaque areas are where one is most likely to find an electron at any given time.CompositionElementary particleDiscoveredJ. J. Thomson (1897)Mass9.1093837015(28)×10−31 kg 5.48579909070(16)×10−4 u [1822.8884845(14)]−1 u 0.51099895000(15) MeV/c2