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

User Sarvar Nishonboyev
by
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1 Answer

5 votes

Answer:

9

Step-by-step explanation:

mass number = protons + neutrons

= 4 + 5 = 9

User Evan
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