12. What is the mass number of an atom that has 4 protons, 4 electrons, and 5 neutrons?

asked Jan 26, 2022 26.4k views

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5 votes

Answer:

Step-by-step explanation:

mass number = protons + neutrons

= 4 + 5 = 9

Evan answered Jan 30, 2022

by Evan

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