Multiple Choice
Which of the following polyatomic ions has a 2- charge?
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3. Chemical Reactions
Polyatomic Ions
Multiple Choice
Which of the following is the correct chemical formula for the polyatomic ion ammonium?
A
NH_4^-
B
NO_3^-
C
NH_4^+
D
NH_3^+
Verified step by step guidance1
Understand that a polyatomic ion is a charged species composed of two or more atoms covalently bonded together that carry an overall charge.
Recall that the ammonium ion is a common polyatomic ion formed by nitrogen and hydrogen atoms with a positive charge.
Analyze the given options and their charges: \(\mathrm{NH_4^-}\) (negative charge), \(\mathrm{NO_3^-}\) (nitrate ion, negative charge), \(\mathrm{NH_4^+}\) (ammonium ion, positive charge), and \(\mathrm{NH_3^+}\) (not a common stable ion).
Recognize that the ammonium ion has the formula \(\mathrm{NH_4^+}\), which consists of one nitrogen atom bonded to four hydrogen atoms and carries a +1 charge.
Conclude that the correct chemical formula for the ammonium ion is \(\mathrm{NH_4^+}\).
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