Scelta multipla
Which two particles have opposite charges?
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2. Atoms & Elements
Ions
Scelta multipla
Which of the following ions is a cation?
A
Cl^-
B
NO_3^-
C
SO_4^{2-}
D
Na^+
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Understand that a cation is a positively charged ion, while an anion is a negatively charged ion.
Look at the charge notation for each ion: Cl^- has a negative charge, NO_3^- has a negative charge, and SO_4^{2-} has a double negative charge.
Since all the ions listed (Cl^-, NO_3^-, SO_4^{2-}) have negative charges, they are all anions, not cations.
Recognize that Na^+ has a positive charge, indicated by the superscript plus sign, making it a cation.
Therefore, among the given options, Na^+ is the cation because it carries a positive charge.
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