Chemistry

Question Analysis
This question involves identifying an element and its isotope name from proton/neutron counts.
The main focus is on using atomic number (protons) for element identity and mass number for isotope naming.

Key Concept Explanation
Element identity = atomic number (protons): 17 protons = chlorine (Cl, atomic number 17).
Isotope name = element name + mass number (protons + neutrons): 17 + 18 = 35 → chlorine-35.

Step-by-Step Solution
1. Find element from protons: 17 protons = chlorine (check periodic table).
2. Calculate mass number: 17 + 18 = 35.
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