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Nearly the entire mass of an atom is comprised by its nucleus. The hydrogen atom is no exception. The mass of a typical hydrogen atom (known as protium, P) is 1amu, which tells you that it consists of 1 proton. Of course, there's also 1 electron, but this electron's mass doesn't come into play (an electron's mass is about 0.0005amu).
On the Periodic Table, the Atomic Mass of hydrogen comes in at about 1.00794. This is a result of the small of percentage of all hydrogen out there that consists of more massive isotopes. H-2 (deuterium, D) has 1 neutron; H-3 (tritium, T) has 2 neutrons. The 1.00794 is a weighted average of these relative abundances.
Another viewpoint:
I think the answer is simpler than that. The question may simply be about the fact that the measured mass includes an electron, but the nuclear mass does not. It depends a bit on how you interpret this question.
Anyway, the proton has about 1836 times the mass of an electron.
So, the mass of a hydrogen atom is almost the same as the mass of the nucleus, as mentioned above.
Incidentally, the definition of atomic mass (which is slightly different from "nuclear mass") is not quite as straightforward as some people may think.
The atomic mass of "protium" is, in fact, not 1 amu, but about 1.00782 amu.
So, for the atomic mass of hydrogen, the mass of the electron is actually slightly more important than the effect of the small amounts of heavy isotopes.
You may want to click on the link below for more details on the atomic mass of hydrogen.
(Strictly speaking I think you should call that the "relative atomic mass" when talking about all the isotopes together in a sample, but that's a bit pedantic here.)
The Wikipedia page "Isotopes of hydrogen" is useful too.
Also, there's a link below to a "related question".
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How is matter quantified?
Matter is quantified using the concept of mass. Mass is a measure of the amount of matter in an object and is typically measured in units such as kilograms or grams. The mass of an object can be determined by using a balance or a scale to compare it to a standard mass.
How do you identify mass?
Mass is a measurement of the amount of matter in an object. It can be identified by using a balance scale to compare the object's mass to a known mass standard. The unit of mass is typically measured in grams or kilograms.
What can be used to compare the objects of mass?
Objects can be compared based on their mass using a balance scale, a spring scale, or by measuring their weight using a tool like a digital scale. The units for mass are typically measured in grams or kilograms.
Is Jupiter a failed star?
No, Jupiter is not a failed star. It is a gas giant planet made mostly of hydrogen and helium, while stars are made mostly of hydrogen and undergo nuclear fusion to produce energy. Jupiter does not have enough mass to sustain nuclear fusion and become a star.
What would stars be like if hydrogen rather than iron had the lowest mass per nuclear particle?
If hydrogen had the lowest mass per nuclear particle, stars would be much less massive since they are primarily made up of hydrogen. This would result in shorter and less energetic lifespans for stars, leading to different evolutionary paths and outcomes in the universe. Additionally, the fusion processes within stars would be different, impacting the production of elements and the overall chemical composition of the universe.
