Chemistry

Question Analysis
This question assesses the student's understanding of the components that make up the mass number of an atom.

Key Concept Explanation
The mass number of an atom is the total number of protons and neutrons in the nucleus. Protons and neutrons are collectively known as nucleons.

Step-by-step Solution
1. Recall the definition of mass number.
2. Identify that the mass number is the sum of the number of protons and neutrons in the nucleus.
3. ...