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Which is an anion?
a 02-
b. Ca2+
c.к*
d.Agt

User Stevenn
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1 Answer

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Final answer:

The oxide ion (O2-) is an anion because it carries a negative charge, while the other ions listed are cations with positive charges.

Step-by-step explanation:

An anion is a negatively charged ion, which means it has gained electrons. In the options provided, (a) O2- represents an anion, specifically the oxide anion. This is because it carries a negative charge, indicated by the '2-' after the 'O' for oxygen. The other options like Ca2+, K+, and Ag+ represent cations, which are positively charged ions.

User LuckSound
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