Biology CLEP Prep Practice Exam 2026 – Your All-in-One Guide to Exam Success!

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

Sodium

Hydrogen

Chloride

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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