Biology CLEP Prep Practice Exam

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Which of the following is NOT an example of an ion?

  1. Sodium

  2. Hydrogen

  3. Chloride

  4. Glucose

The correct answer is: Glucose

An ion is an atom or molecule that has an unequal number of protons and electrons, giving it a positive or negative charge. Sodium, hydrogen, and chloride are all examples of ions because these elements have lost or gained an electron to form a positive or negative charge. Glucose, on the other hand, is a non-ion because it does not have an unequal number of protons and electrons. It remains electrically neutral and therefore is not an example of an ion. This makes option D the correct answer.

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