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The isotopes Cl-35 and Cl-37 (both with atomic number 17) differ in which of the following?

1. Atomic Number
2. Number of neutrons
3. Number of electrons
4. Number of protons

Correct answer: Number of neutrons

Solution

Cl-35 has 18 neutrons and Cl-37 has 20 neutrons; atomic number, number of protons, and number of electrons are all 17 in both — only the neutron count differs.

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