an atom has 70 protons, 70 electrons, and 99 neutrons. what is the mass number? group of answer choices

asked Apr 26, 2023 227k views

12 votes

by Llekn

6.6k points

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4 votes

Answer:

169

Step-by-step explanation:

protons+neutrons=atomic mass

70+99=169

ToddR answered May 1, 2023

by ToddR

6.6k points

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