How many electrons does the ion ³⁷₁₇Cl⁻ contain?

Answer and explanation

Correct answer: B. 18

  1. Step 1: The atomic number is 17, so the neutral atom has 17 electrons.
  2. Step 2: With charge -1, the electrons number 17-(-1)=18.
Answer
18.
Why not the others: 17: this is the number of protons; the charge was ignored. 16: the charge was applied in the wrong direction. 20: this is the number of neutrons.

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