Chemistry

Question Analysis
This question tests the student's ability to calculate the mass number of an isotope given the atomic number and the number of neutrons.

Key Concept Explanation
The mass number (A) is the sum of the number of protons (Z) and neutrons (N) in the nucleus. The relationship can be expressed as .

Step-by-step Solution
1. Identify the given values: atomic number (Z) = 11, number of neutrons (N) = 14.
2. Use the formula