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Which of the following is the correct formula for the sulfate ion, a common polyatomic ion?
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3. Chemical Reactions
Polyatomic Ions
Multiple Choice
Which of the following is a polyatomic ion?
A
Mg^{2+} (magnesium ion)
B
NO_3^- (nitrate)
C
Cl^- (chloride ion)
D
Na^+ (sodium ion)
검증된 단계별 안내1
Understand what a polyatomic ion is: it is an ion composed of two or more atoms covalently bonded together that carry an overall charge.
Examine each option to determine if it consists of multiple atoms or just a single atom:
Mg^{2+} is a magnesium ion, which is a single atom with a charge of +2, so it is a monatomic ion.
Cl^- is a chloride ion, a single chlorine atom with a charge of -1, so it is also a monatomic ion.
Na^+ is a sodium ion, a single sodium atom with a charge of +1, so it is a monatomic ion.
NO_3^- (nitrate) consists of one nitrogen atom and three oxygen atoms bonded together, carrying an overall charge of -1, making it a polyatomic ion.
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