Answer
This set of values is impossible.
Work Step by Step
1. Is the atomic number equal to the number of protons?
- Yes, they are equal. (15)
2. Is the sum of the number of protons and neutrons equal to the mass number?
Sum: $15 + 15 = 30$
Mass number: 32
- No, they aren't equal. ($30 \ne 32$)
- Therefore, these values aren't possible.
