What is the mass number of an atom that is made up of 38 protons, 49 neutrons, and 38 electrons?
A) 38
B) 49
C) 87
D) 125

Name: What is the mass number of an atom that is made up of 38 protons, 49 neutrons, and 38 electrons? A) 38 B) 49 C) 87 D) 125
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Quizplus · Accepted Answer

The mass number of an atom is the sum of protons and neutrons in its nucleus. Therefore, mass number = 38 protons + 49 neutrons = 87. The number of electrons does not affect the mass number as they have negligible mass.

What Is the Mass Number of an Atom That Is