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ivolga24 [154]
3 years ago
8

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

Chemistry
1 answer:
NeTakaya3 years ago
7 0

Answer:

9

Explanation:

mass number = protons + neutrons

= 4 + 5 = 9

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