Oxygen Which of the following is a transition metal? Iron Neon Barium

## Step 1<br />The problem asks us to identify which of the given options is a transition metal. Transition metals are elements that fall within the d-block of the periodic table, which includes groups 3-12. These elements are characterized by their ability to form stable, partially filled d-orbital electrons.<br /><br />## Step 2<br />Looking at the options, we can see that Iron (Fe) is a transition metal. It falls within the d-block of the periodic table, specifically in Group 8.<br /><br />## Step 3<br />On the other hand, Neon (Ne) is a noble gas, which is located in Group 18 of the periodic table. Noble gases are known for their full electron shells, which make them stable and unreactive.<br /><br />## Step 4<br />Lastly, Barium (Ba) is an alkaline earth metal, which is located in Group 2 of the periodic table. Alkaline earth metals are known for their two valence electrons, which they readily lose to form +2 cations.