Chemistry

Question Analysis
This question evaluates the student's ability to determine the number of neutrons in an isotope given its atomic number and mass number.

Key Concept Explanation
The mass number (A) is the sum of the number of protons and neutrons in the nucleus. The atomic number (Z) is the number of protons.

Step-by-step Solution
1. Identify the atomic number (Z) and mass number (A) of the isotope: Z = 7, A = 15.
2. Calculate the number of neutrons by subtracting the atomic nu...