Ontario Grade 9 Science Class Practice Exam

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What is an ion?

  1. A neutral particle

  2. A particle with just a positive charge

  3. A particle with either a positive or negative charge

  4. A particle with both a positive and negative charge

The correct answer is: A particle with either a positive or negative charge

An ion is a particle that has either a positive or negative charge. Option A is incorrect because a neutral particle does not have a charge. Option B is also incorrect because a positive charge alone does not make a particle an ion. Option D is incorrect because a particle with both a positive and negative charge would cancel out and result in a neutral particle. Therefore, the correct answer is option C, as it accurately describes the concept of an ion having a charge of either polarity.

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