Chemistry

Question Analysis
This question evaluates the student's ability to write the correct symbol for an isotope given the number of protons and neutrons.

Key Concept Explanation
The symbol for an isotope is written as , where is the mass number (sum of protons and neutrons), is the atomic number (number of protons), and is the element symbol.

Step-by-step Solution
1. Identify the number of protons: 19 (atomic number, ).
2. Identify the number of neutrons: 22.
3. Calculate the mass number:

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