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In naturally occurring hydrogen, most of the mass is that of the hydrogen-1 isotope.

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12y ago

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Why do the isotopes of hydrogen have a greater ratio of mass difference than the ratios for any other isotopes of other elements?

The isotopes of hydrogen have a greater ratio of mass difference because hydrogen has the smallest atomic mass compared to other elements. Since the mass of hydrogen isotopes differs significantly (H-1, H-2, and H-3), the ratio of their mass difference is also relatively larger. This makes the difference in mass between hydrogen isotopes more pronounced compared to isotopes of other elements, which have higher atomic masses.


When a pair of hydrogen isotopes is fused is the mass of the product nucleus more or less the sum of the masses of the two hydrogen nuclei?

Because of conservation of matter the nucleus would weigh the same as the sum of the two isotopes.


How does the measured mass of hydrogen compare with its nuclear mass due to one proton?

The mass of the whole hydrogen atom includes the mass of an electron as well as the proton. The proton mass is nearly 2000 (actually about 1836) times greater than the electron mass. So, the mass of the hydrogen atom isn't much different from the mass of the proton. It's also possible this question could be about isotopes. Hydrogen has rare isotopes with one or two neutrons in the nucleus. So, the average mass of hydrogen, as measured, is usually a bit more than you would expect from just a proton and electron. However, these other isotopes are very rare and the effect on the mass of a sample of hydrogen would be very small.


What is a hydrogen isotope with a mass of 3?

The hydrogen isotope with a mass of 3 is tritium. It consists of one proton and two neutrons, making it heavier than the more common hydrogen isotopes deuterium (mass 2) and protium (mass 1). Tritium is radioactive and is often used in nuclear reactions and research.


How does the measured mass of hydrogen compare with its nuclear mass?

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".


What is the difference between mass of hydrogen and mass of electron?

There are different isotopes of hydrogen. Assuming you mean the difference in atomic mass between a proton and an electron though, the atomic mass of a proton is about 1836 times greater (approx 1.007 amu), and the neutron is a little more than that (approx 1.009 amu).


Is the atomic mass used for the mass of an element which has isotopes?

Yes, it must be used as all elements have one or more isotopes and all elements have an atomic mass.


The atomic mass of hydrogen is 1.00794 Why is this number not rounded off to 1?

because it 's the lightest element in the periodic table.The amu is defined based on carbon-12, so all other isotopes of elements are non-integer masses. This is sometimes referred to as the "mass defect".The atomic mass of an element is the weighted average of the atomic masses of its natural isotopes. For hydrogen these are hydrogen-1 and hydrogen-2 (deuterium).


What has more mass hydrogen or helium?

Helium has more mass than hydrogen. Helium is composed of two protons and two neutrons, while hydrogen is a single proton.


Are they more than a single neutron in an atom?

yes (except for the two isotopes of hydrogen).


How percentage of oxygen is more in water than hydrogen?

This is true for mass-%. Oxygen is 16 times heavier than hydrogen, that outfigures the double elemental ratio for hydrogen to oxygen (2:1) by factor 8 times.


What best describes the weight average of atomic mass on an element?

The weight average atomic mass of an element is a weighted average of the masses of all its isotopes, taking into account their natural abundance. This gives a more accurate representation of the actual mass of an element in the natural world.