Chemistry

Question Analysis
This question involves distinguishing isotopes from ions, neutron calculation, and charge-based electron count adjustment.
The main focus is on separating isotopic identity (protons/neutrons) from ionic charge (electron count).

Key Concept Explanation
Isotope: defined by protons/neutrons (unchanged by charge); is an oxygen isotope (8 protons).
Ion charge: electrons = protons ± charge (anion: add electrons; cation: remove electrons).
For -2 charge: electrons = 8 + 2 = 10.

Step-by-Step Solution
1. Isotope confirmation: 8 protons = oxygen, mass number 17 → isotope of oxygen.
2. Neutrons =

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