Chemistry

Question Analysis
This question involves calculating neutron counts for isotopic ions/neutral atoms and identifying a matching pair.
The main focus is on applying the neutron calculation formula (mass number – atomic number) across different elements, isotopes, and charge states.

Key Concept Explanation
Neutron count depends only on mass number (superscript) and atomic number (subscript) → charge (ions) does not affect neutrons.
Formula: Neutrons = mass number (A) – atomic number (Z)

Step-by-Step Solution
1. Calculate neutrons for each particle:
Particle 1 ( ): 16 – 8 = 8 neutrons
Particle 2 ( ): 18 – 8 = 10 neutrons
Particle 3 ( ): 19 – 9 = 10 neutrons
Particle 4 (

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