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Let's practice identifying ions. Answer the following questions by clicking on the circle in front of the response that best answers the question.

1. What is the charge on magnesium? Click here for answers.

2. Which of the following elements is a cation?

3. An anion has a:

4. How many valence electrons does chlorine have?


1. 2+, magnesium is a metal so it will be positive and will give away 2 electrons.

2. Calcium since it is a metal.

3. Anions have a negative charge since they are gaining electrons which have a negative charge.

4. Chlorine has 7 valence electrons or electrons in the outermost energy level.