Multiple Choice
Which type of element is most likely to form an anion?
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2. Atoms & Elements
Ions
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Which of the following would be a negative ion with a single charge?
A
Mg^{2+}
B
O^{2−}
C
Cl^−
D
Na^+
Verified step by step guidance1
Understand that ions are atoms or molecules that have gained or lost electrons, resulting in a net electric charge.
Identify the charge on each ion given: $\mathrm{Mg^{2+}}$ has a +2 charge, $\mathrm{O^{2-}}$ has a -2 charge, $\mathrm{Cl^-}$ has a -1 charge, and $\mathrm{Na^+}$ has a +1 charge.
Focus on ions with a negative charge (anions), which means they have gained electrons.
Among the options, $\mathrm{O^{2-}}$ has a charge of -2, which is a negative ion but with a double charge, not a single charge.
The ion $\mathrm{Cl^-}$ has a single negative charge (-1), making it the correct choice for a negative ion with a single charge.
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