Final answer:
Both gold and iron are examples of native elements, which are materials that occur in nature in their pure form without being combined with other elements. Calcite and halite are compounds, not native elements. Lead can also be a native element but is typically found within minerals.
Step-by-step explanation:
The question asks about native elements, which are materials found in nature in their pure form without being combined with other elements. Gold (Au), silver (Ag), copper (Cu), and several other elements can occur naturally in their elemental state. Of the options provided in the question, both gold and iron can be considered native elements, as they can be found naturally in their pure metallic form. Calcite, made primarily of calcium carbonate (CaCO3), is a compound, not a native element. Halite, composed of sodium chloride (NaCl), is also a compound. While lead (Pb) typically occurs in minerals, it can also be found in its native element form in rare cases.