Answer in Brief
What is the difference between a cation and an anion ? Explain with examples.
|1. Cation a positively charged ion.||1. Anion is a negatively charged ion.|
|2. When a neutral atom loses one or more electrons, it develops an overall positive charge and becomes a cation.||2. When a neutral atom gains one or more electrons, it develops an overall negative charge and becomes an anion.|
|3. A cation has fewer electrons than the neutral (normal) atom of that element.||3. An anion has more electrons than the neutral (normal) atom of that element.|
|4. Example: Sodium atom readily loses an electron to form a positively charged sodium ion.
Na → Na+ + e−
|4. Example: Chlorine atom accepts an electron to become a negatively charged chloride ion.
Cl + e− → Cl−
|Similarly, calcium atom loses two electrons to become a positively charged calcium ion. Thus, the cation formed has two units of positive charge.
Ca → Ca2++ 2e−
|Oxygen atom readily accepts two electrons to become a negatively charged oxygen ion. Thus, the oxygen anion formed has two units of negative charge.
O + 2e− → O2−
Concept: Ions (Radicals) and Its Types
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