How do you find the amu?

The Atomic Mass unit (amu) is defined based on the mass of carbon-12, specifically, one amu is one twelfth of the mass of a carbon-12 atom. To find the amu of an element, you can refer to the Periodic Table, which lists the atomic mass of each element in amu. This value is a weighted average of the masses of all the naturally occurring isotopes of the element, taking into account their relative abundances. For precise measurements, mass spectrometry can also be used to determine the amu of isotopes directly.