Chemistry

Question Analysis
This question tests the student's understanding of the relationship between the number of protons, neutrons, and the mass number of an isotope.

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

Step-by-step Solution
1. Identify the number of protons: 22.
2. Identify the number of neutrons: 27.
3. Calculate the mass number:

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