객관식
Hydrogen has three isotopes: 1H, 2H, and 3H. Which of the following names correctly matches the isotope 2H?
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2. Atoms & Elements
Isotopes
객관식
Which of the following is the correct symbol for the carbon isotope that contains seven neutrons?
A
C-12
B
C-13
C
C-13
D
C-14
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검증된 단계별 안내1
Recall that the isotope notation C-\(A\) indicates a carbon atom with a mass number \(A\), where the mass number is the sum of protons and neutrons in the nucleus.
Know that carbon has an atomic number \(Z = 6\), which means every carbon atom has 6 protons.
Use the relationship: \(\text{Number of neutrons} = \text{Mass number} - \text{Number of protons}\).
For each isotope option, calculate the number of neutrons by subtracting 6 (protons) from the mass number: for example, for C-13, neutrons = 13 - 6 = 7.
Identify the isotope whose neutron count matches 7; this corresponds to C-13, making it the correct symbol for the carbon isotope with seven neutrons.
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