객관식
How many neutrons are present in an atom of thorium-234?
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2. Atoms & Elements
Isotopes
객관식
Which of the following isotopes has 45 neutrons?
A
Titanium-45 (Ti, atomic number 22)
B
Scandium-66 (Sc, atomic number 21)
C
Vanadium-68 (V, atomic number 23)
D
Calcium-45 (Ca, atomic number 20)
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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 mass number (the number after the element name) and the atomic number (given for each element) for each isotope option.
Calculate the number of neutrons for Titanium-45: \(45 - 22\).
Calculate the number of neutrons for Scandium-66: \(66 - 21\).
Calculate the number of neutrons for Vanadium-68: \(68 - 23\), and for Calcium-45: \(45 - 20\), then compare all results to find which isotope has exactly 45 neutrons.
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