Question

Which is an anion ca2+ ag+ o2- k+

Answer 1

Answer:

O2- is an anion

Explanation:

An atom or molecule is said to be neutral when it has a zero net charge. In contrast, if the system has a net charge it is termed as an ion.

A cation is an atom or a molecular system with a net positive charge whereas an anion carries a net negative charge.

In the given examples:

Ca2+ : net positive, cation

Ag+: net positive, cation

O2-: net negative, anion

K+: net positive, cation

Answer 2

The 3rd one.
O2-
It is an Anion because the Oxygen atom has one extra electron from another atom.