A metallic atom loses its valence electron to form a/an _________?
Correct answer: B. a cation
- A. an anion
- B. a cation
- C. an anion - cation
- D. none of these
Explanation
Loss of an electron leaves a species with more protons than electrons, giving it a net positive charge. A positively charged ion is called a cation, whereas gaining electrons produces an anion. Students may choose anion because they remember ion formation but reverse the effect of electron loss.
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About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
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