Isotope.
Most of the atom's mass is concentrated in the nucleus.
The nucleus, made up of protons and neutrons, contains most of an atom's mass.
An Aluminum atom is 26.9815 AMU on *average*.
Most of the mass in an atom is in the nucleus. The protons and neutrons are about the same weight, 1 amu. The elecrtons are 1/1840 of the mass of an proton. Neutrons are 2000 times heavier than electrons and protons have an equal mass of neutrons
It is called the nucleus and has a mass unit number of one.
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.
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The atomic mass of an element is the relative mass of its atom as compared with the mass of a carbon-12 atom taken as 12 units.
Atomic Mass is the number of protons and neutrons in an atom.
relative atomic mass
it is compared to carbon-12
Protons and neutrons have a relative mass of one, electrons have a relative mass of 1/2000
The most mass of an atom is found in the nucleus.
The weighted atomic mass of calcium is 40.1 g/mole and helium is 4.0 g/mole
It depends on the context. Compared to an atom it is huge, compared to the sun it is tiny.
The mass and volumes of electrons are not significant compared to the volume of an atom.
This is because the mass of electron is without importance compared to the mass of protons and neutrons.