Aeff=(Zeff)/((Z/A)eff)
Zeff=wi*Zi
wi is weight fraction in ith element in compound. for example water has 0.112 H and 0.888 O.
(Z/A)eff=wi*Zi/Ai
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The atomic mass of Mg is 24.3 amu.
It is 20.18
Number of protons plus the number of neutrons (electrons don't matter as they have such a small mass).
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
== The equation of atomic mass is protons+nuetrons== atomic mass. ===