What is the chemical formula of chloride ion?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the chemical formula of chloride ion?

Explanation:
Chlorine atoms gain one extra electron to fill their outer shell, becoming negatively charged ions called chloride. The symbol for this ion is Cl^-—chlorine with a minus sign showing its single negative charge. The other possibilities aren’t the chloride ion: Cl2 is just a molecule of two chlorine atoms, while ClO- and ClO4- are oxyanions (they include oxygen) with different numbers of atoms and different charges. So the chloride ion’s formula is Cl^-.

Chlorine atoms gain one extra electron to fill their outer shell, becoming negatively charged ions called chloride. The symbol for this ion is Cl^-—chlorine with a minus sign showing its single negative charge. The other possibilities aren’t the chloride ion: Cl2 is just a molecule of two chlorine atoms, while ClO- and ClO4- are oxyanions (they include oxygen) with different numbers of atoms and different charges. So the chloride ion’s formula is Cl^-.

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