Multiple Choice
How are isotopes of an element different from each other?
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2. Atoms & Elements
Isotopes
Multiple Choice
Which of the following isotopes has the same number of neutrons as nitrogen-15 (N-15)?
A
Boron-11 (B-11)
B
Carbon-14 (C-14)
C
Oxygen-17 (O-17)
D
Fluorine-19 (F-19)
Verified step by step guidance1
Identify the number of neutrons in nitrogen-15 (N-15). The number of neutrons is given by the formula: \(\text{Neutrons} = \text{Mass number} - \text{Atomic number}\). For nitrogen, the atomic number is 7, so calculate \$15 - 7$.
Calculate the number of neutrons for each isotope option using the same formula: \(\text{Neutrons} = \text{Mass number} - \text{Atomic number}\). You will need the atomic numbers for boron (5), carbon (6), oxygen (8), and fluorine (9).
For Boron-11 (B-11), calculate \$11 - 5$ to find its neutrons.
For Carbon-14 (C-14), calculate \$14 - 6$ to find its neutrons.
For Oxygen-17 (O-17), calculate \$17 - 8\( to find its neutrons, and for Fluorine-19 (F-19), calculate \)19 - 9$. Compare these values to the number of neutrons in nitrogen-15 to determine which isotope has the same number of neutrons.
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