Multiple Choice
What are the atomic number and mass number for the carbon isotope with seven neutrons?
2. Atoms & Elements
Isotopes
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How many neutrons does the isotope nitrogen-15 have?
A
7
B
8
C
15
D
14
Verified step by step guidance1
Identify the atomic number of nitrogen, which is 7. This number represents the number of protons in the nucleus of a nitrogen atom.
Understand that the mass number of an isotope is the sum of its protons and neutrons. For nitrogen-15, the mass number is 15.
Use the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \).
Substitute the known values into the formula: \( \text{Number of neutrons} = 15 - 7 \).
Calculate the result to find the number of neutrons in nitrogen-15.
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