An isotope's mass number is the sum of the protons and neutrons in each atomic nucleus of the isotope.
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The atomic mass NUMBER equals the number of protons and neutrons in an atom. DO NOT confuse this with the mass of an atom.
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
We can find Atomic Mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
The atomic mass number of iodine is 17.8923
Atomic number 6, atomic mass 12.