Chemistry

Question Analysis
This question involves nuclear notation interpretation, subatomic particle calculation, neutral atom electron rules, and isotope naming.
The main focus is on integrating multiple concepts (atomic number, mass number, neutral atom charge balance) for a single isotope.

Key Concept Explanation
Nuclear notation : = protons (atomic number), = mass number (protons + neutrons).
Neutral atom: electrons = protons (charge balance: protons = +1, electrons = -1).
Isotope naming: element name + mass number ( ).

Step-by-Step Solution
1. Protons = subscript = 19.
2. Neutrons =

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