Atomic Mass Video Lessons

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Problem: What two factors determine the atomic mass of an element?

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Atomic mass is the mass of a single atom approximately equal to the mass number of the atom. 

• Each proton and each neutron contribute approximately one amu (atomic mass unit) to the mass of the atom.

• Electrons are ignored because electrons weigh a lot less than protons and neutrons.


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What two factors determine the atomic mass of an element?

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