객관식
Which of the following statements about stable isotopes is correct?
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2. Atoms & Elements
Isotopes
객관식
Which isotope of fluorine has 10 neutrons?
A
F-17
B
F-20
C
F-19
D
F-18
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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): \(\text{Number of neutrons} = A - Z\).
Identify the atomic number of fluorine (F), which is the number of protons. For fluorine, \(Z = 9\).
For each isotope, the mass number \(A\) is the number after the element symbol (e.g., for F-17, \(A = 17\)).
Calculate the number of neutrons for each isotope by subtracting the atomic number from the mass number: \(\text{neutrons} = A - 9\).
Find the isotope where the number of neutrons equals 10 by solving \(A - 9 = 10\), which gives \(A = 19\). Therefore, the isotope with 10 neutrons is F-19.
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