Ion charges quiz
Atoms gain or lose electrons to form ions with a predictable charge. See an element and choose the charge of its most common ion.
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How it works
The 10 questions use elements with one common ion charge, such as sodium (+1), oxygen (−2) and chlorine (−1). The answer appears immediately, and your best score is saved on this device.
Play it three ways: a classic round of 10 questions, a 60-second speed round (25 right answers earns a star), or survival, where you keep going until you miss three.
Tips
- Metals lose electrons and form positive ions; nonmetals gain electrons and form negative ions.
- Group 1 forms +1 ions, group 2 forms +2 ions and aluminum forms +3 ions.
- Group 15 nonmetals form −3 ions, group 16 forms −2 and group 17 forms −1.