Question

lead (pb), silver (ag), and iron (fe) are examples of which of the following?
a molecules
b compounds
c elements
d all of the above

Explanation:

• Molecules: Molecules are made up of two or more atoms chemically bonded together. For example, \(O_2\) (oxygen molecule) is made of two oxygen atoms. Lead (Pb), silver (Ag), and iron (Fe) are not composed of multiple atoms in this sense. They are single - atom species in their elemental form.
• Compounds: Compounds are substances formed when two or more different elements chemically combine. For example, \(H_2O\) (water) is a compound of hydrogen and oxygen. Since Pb, Ag, and Fe are not combinations of different elements, they are not compounds.
• Elements: Elements are pure substances that cannot be broken down into simpler substances by chemical means. Each element has a unique set of properties. Lead (Pb), silver (Ag), and iron (Fe) are all listed in the periodic table of elements. They have their own distinct atomic structures and properties and are not composed of other substances.

Answer:

C. elements