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To find the atomic mass of a particular atom you need to know

a. the number of protons.
b. the number of neutrons.
c. the number of protons and neutrons.
d. simply what element the atom belongs to.

User Andynil
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Answer:

C. the number of protons and neutrons

User Cadilac
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You just need the number of protons and number of neutrons as the mass of eelctrons is negligible
User Hardik Barot
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