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Lead (Pb) is not a transition metal; it is a post-transition metal. Its most common oxidation state is +2, but it can also exhibit oxidation states of +4 and +1 in certain compounds.
Yes, nickel is a transition metal. Transition metals typically have properties such as variable oxidation states, colorful compounds, complex ion formations, and catalytic activity. Nickel exhibits these properties, making it a classic example of a transition metal.
Yes, iron is a transition metal. Transition metals are elements found in the d-block of the periodic table, and they exhibit a variety of oxidation states and often form colorful compounds. Iron, with atomic number 26, is a classic example of a transition metal.
No. Both are elements. Helium is a noble gas and iron is a transition metal.