Which of the following metals exhibits more than one oxidation state?
Correct answer: D. Fe
- A. Na
- B. Al
- C. Mg
- D. Fe
Explanation
The correct answer is Fe. Iron is a transition metal, which typically means it can exhibit more than one oxidation state. Iron commonly shows +2 and +3 oxidation states because it can lose different numbers of electrons. In contrast, sodium (Na), aluminum (Al), and magnesium (Mg) are not transition metals and generally exhibit only one oxidation state, which is +1 for Na, +3 for Al, and +2 for Mg, as they achieve stable electron configurations by losing a specific number of electrons.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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