Question

topic5 d4 assessment periodic table
13 of 42

1. which of the following is an ion?

○ lithium 3
○ o2-
○ c
○ hcl

Explanation:

Step1: Recall the definition of an ion

An ion is an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

Step2: Analyze each option

• Lithium 3: This is likely referring to a lithium atom with a mass number of 3. It is a neutral atom, not an ion.
• O2-: This is an oxygen ion. The negative charge indicates that it has gained two electrons.
• C: This is a carbon atom. It is neutral.
• HCl: This is a molecule (hydrogen chloride). It is neutral.

Answer:

O2-