What is the number of neutrons in a neutral atom of Ar-40?
A)18
B)22
C)40
D)58

Name: What is the number of neutrons in a neutral atom of Ar-40? A)18 B)22 C)40 D)58
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Quizplus · Accepted Answer

Argon-40 (Ar-40) has an atomic number of 18, which means it has 18 protons. Since it's a neutral atom, it also has 18 electrons. The mass number (40) is the sum of protons and neutrons. Therefore, to find the number of neutrons: 40 (mass number) - 18 (protons) = 22 neutrons.

What Is the Number of Neutrons in a Neutral Atom