Chemistry

Question Analysis
This question involves calculating neutron counts for a reference isotope (neutral chlorine-37) and comparing it to other isotopic ions/neutral atoms.
The main focus is on applying the neutron calculation formula (mass number – atomic number) and ignoring ion charge (which only affects electrons).

Key Concept Explanation
Neutron count = mass number (A) – atomic number (Z) (charge has no impact on neutrons, as charge only changes electron count).
Reference particle: neutral chlorine-37 ( ) → neutrons = 37 – 17 = 20.

Step-by-Step Solution
1. Calculate neutrons for the reference particle (Cl-37): neutrons.
2. Calculate neutrons for each option:
A) : neutrons (matches the reference).
B) : neutrons (does not match).
C)

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