객관식
Which isotope has 18 protons and 22 neutrons?
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2. Atoms & Elements
Isotopes
객관식
Which isotope of argon (Ar) has 22 neutrons?
A
Ar-39
B
Ar-36
C
Ar-38
D
Ar-40
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검증된 단계별 안내1
Recall that the number of neutrons in an isotope is given by the difference between the mass number (A) and the atomic number (Z): \(\text{Neutrons} = A - Z\).
Identify the atomic number of argon (Ar), which is the number of protons. Argon has an atomic number \(Z = 18\).
For each isotope, subtract the atomic number from the mass number to find the number of neutrons. For example, for Ar-39, neutrons = \(39 - 18\).
Calculate the number of neutrons for each isotope: Ar-36, Ar-38, Ar-39, and Ar-40, using the formula \(\text{Neutrons} = A - 18\).
Compare the calculated neutron numbers to 22 and identify which isotope corresponds to 22 neutrons.
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