Praxis II General Science

Category - Major Ideas

Which of the following is not a positively charged ion in its natural state?
  1. Silver
  2. Sodium
  3. Lithium
  4. Oxygen
  5. Iron
Explanation
Answer: D - Oxygen is not positively charged in its natural state, and is instead negatively charged. Oxygen is normally found as O2-, as indicated by its position on the periodic table.
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