Vanadium 50 said:They don't. One example does not mean "usually".
Vanadium 50 said:
Still not usual. The lists I use to use contain all elements. So in certain cases, it might make no sense to talk about light elements, or it's due to layout reasons, whatsoever. The fact, that you ask, makes me think, you suggest some underlying, hidden meaning. There is none. If someone created a list which starts with oxygen, so it's this someone whom you should ask. Otherwise it's simply guesswork about the author's intentions.alizade said:I have read about 10 such articles.
Nuclear mass tables typically start with hydrogen because it is the lightest and most abundant element in the universe. It serves as a reference point for all other elements, with a mass number of 1 and an atomic number of 1.
Hydrogen is listed twice in nuclear mass tables because it exists in two stable isotopes, hydrogen-1 and hydrogen-2. The two isotopes have slightly different masses due to the presence of an extra neutron in hydrogen-2.
Nuclear mass tables use atomic mass units (amu) because they provide a more convenient and standardized way of expressing the masses of different elements. One atomic mass unit is equal to one-twelfth of the mass of a carbon-12 atom, making it easy to compare the masses of different elements.
Nuclear mass tables only list stable isotopes because they are the most common and long-lasting forms of an element. Unstable isotopes, also known as radioactive isotopes, have shorter lifetimes and decay into more stable isotopes. Therefore, they are not included in mass tables as their masses are constantly changing.
Nuclear mass tables include both atomic mass and mass number because they provide different pieces of information about an element's mass. Atomic mass represents the average mass of all the isotopes of an element, while mass number represents the number of protons and neutrons in an isotope. Both values are important for understanding the characteristics and behavior of different elements.