The International System of Units (SI Units) specifies the basic unit of mass to be the kilogram (kg). All other units of mass are derived from this official standard.
There is, however something called an Atomic Mass Unit (AMU). It is offically recognized by the International System of Units but is a measured quantity, not a defined quantity.
The AMU equals one twelfth of the mass of an atom of carbon-12 and has a value of 1.660538×10−27 kg.
The gram is the basic unit for mass
The basic metric unit of mass is the gram (g).
The unit of weight for elements is typically measured in atomic mass units (amu) or grams. The atomic mass unit is defined as one twelfth of the mass of a carbon-12 atom.
The basic unit of mass in the metric system is the gram.
Atom
An atom is just a basic unit of mass. An ion is when two types of atoms bond.
The gram is the basic unit for mass
The SI unit for mass is the kilogram, denoted as kg.
The basic metric unit of mass is the gram (g).
The basic SI unit for mass is the kilogram (kg).
Atom
an atom
The unit of weight for elements is typically measured in atomic mass units (amu) or grams. The atomic mass unit is defined as one twelfth of the mass of a carbon-12 atom.
Atom
The basic unit of mass in the metric system is the gram.
The relative atomic mass was first proposed by John Dalton in 1803. According to it, the mass of an atom was expressed relative to the mass of one 1H atom. The unit was later changed to 1/16 of the mass of an oxygen atom. However, this measure was discarded when 17O and 18O were discovered. In 1961 the basic unit was changed (once again) to 1/12 of the mass of a 12C atom. The mass of any atom or molecule is measured in atomic mass units (AMU) and the units is defined as 1/12 the mass of a 12Carbon atom.
The smallest basic unit of matter is an atom. Atoms are made up of protons, neutrons, and electrons.