All atomic masses are determined by comparing them to the mass of an atom of carbon12. One atomic mass unit equals one twelfth the mass of an atom of carbon12. That's why its called relativeatomic mass.
The total mass of the atom. In other words the total mass of the protons and neutrons of an atom
It is calculated as the ratio of the mass of one atom of an element to one twelfth of the mass of an atom of carbon-12. In fact, the weighted average of the mass of an atom of an element - weighted according to its isotopic abundance.
One twelfth the mass of a carbon 12 atom is used to define an atomic mass unit (amu) or unified atomic mass unit (u). This unit is used to express atomic and molecular weights on a scale relative to the mass of a carbon-12 atom, making it a common reference point in chemistry.
The mass of an atom is primarily concentrated in its nucleus, which is composed of protons and neutrons. Electrons, which have much less mass, orbit the nucleus in energy levels. The total mass of an atom is determined by the combined mass of its protons, neutrons, and electrons.
Size on the scale of atoms is very hard to define. The electron has zero mass. Quarks have varying amounts of mass.
Carbon-12 isotope is used to define the atomic mass unit, which is equal to 1/12th of the mass of a carbon-12 atom.
No, an oxygen atom does not have twice the mass of a sulfur atom. An oxygen atom has a mass of approximately 16 atomic mass units (amu), while a sulfur atom has a mass of approximately 32 amu. Therefore, a sulfur atom has twice the mass of an oxygen atom.
It will take practically forever. Carbon-12 is not radioactive.
One twelfth (1/12) the mass of a carbon-12 atom is one atomic mass unit (amu, or just u).
The nucleus of an atom represents most of an atom's mass.
The Hydrogen atom. Beware, Hydrogen has an atomic mass based on one proton, as it doesn't have a neutron. So Helium has a mass of four times Hydrogen.