Chemistry

Question Analysis
This question evaluates the student's understanding of the concept of mass number, which is the sum of the number of protons and neutrons in the nucleus of an atom.

Key Concept Explanation
The mass number of an atom is calculated by adding the number of protons and the number of neutrons in the nucleus.

Step-by-step Solution
1. Identify the number of protons: 16.
2. Identify the number of neutrons: 18.
3. Add the number of protons and neutrons: 16 + 18 = 34.<...