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The mass number of an atom is obtained by totaling the number of _____ and _____. A) electrons and protonselectrons B) neutronsprotons and neutrons C) neutrons and isotopes
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The mass number of an atom is obtained by totaling the number of _____ and _____.

A) electrons and protonselectrons
B) neutronsprotons and neutrons
C) neutrons and isotopes

User Craz
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the sum of protons and neutrons inside an atom is your answer


User JaggerJo
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Mass number is the sum of protons and neutrons inside an atom.

Atomic mass = no. of protons + no. of neutrons
User Akiiino
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