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What makes up the atomic mass of an element? the sum of protons and neutrons in the nucleus the sum of neutrons and electrons in the shell the difference between protons and electrons the difference between
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What makes up the atomic mass of an element?

the sum of protons and neutrons in the nucleus
the sum of neutrons and electrons in the shell
the difference between protons and electrons
the difference between electrons and neutrons

User BlackICE
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Answer: The sum of protons and neutrons in the nucleus

Explanation: The Formula For Atomic Mass or Mass Number is

Atomic mass= Protons + Neutrons

User Abdallah Okasha
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